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CERTFR-2026-AVI-0717
Vulnerability from certfr_avis - Published: 2026-06-10 - Updated: 2026-06-10
De multiples vulnérabilités ont été découvertes dans OpenSSL. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| OpenSSL | OpenSSL | OpenSSL versions 1.0.x antérieures à 1.0.2zq | ||
| OpenSSL | OpenSSL | OpenSSL versions 4.x antérieures à 4.0.1 | ||
| OpenSSL | OpenSSL | OpenSSL versions 3.5.x antérieures à 3.5.7 | ||
| OpenSSL | OpenSSL | OpenSSL versions 1.1.x antérieures à 1.1.1zh | ||
| OpenSSL | OpenSSL | OpenSSL versions 3.x antérieures à 3.0.21 | ||
| OpenSSL | OpenSSL | OpenSSL versions 3.6.x antérieures à 3.6.3 | ||
| OpenSSL | OpenSSL | OpenSSL versions 3.4.x antérieures à 3.4.6 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "OpenSSL versions 1.0.x ant\u00e9rieures \u00e0 1.0.2zq",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
},
{
"description": "OpenSSL versions 4.x ant\u00e9rieures \u00e0 4.0.1",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
},
{
"description": "OpenSSL versions 3.5.x ant\u00e9rieures \u00e0 3.5.7",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
},
{
"description": "OpenSSL versions 1.1.x ant\u00e9rieures \u00e0 1.1.1zh",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
},
{
"description": "OpenSSL versions 3.x ant\u00e9rieures \u00e0 3.0.21",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
},
{
"description": "OpenSSL versions 3.6.x ant\u00e9rieures \u00e0 3.6.3",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
},
{
"description": "OpenSSL versions 3.4.x ant\u00e9rieures \u00e0 3.4.6",
"product": {
"name": "OpenSSL",
"vendor": {
"name": "OpenSSL",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-34180",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34180"
},
{
"name": "CVE-2026-35188",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-35188"
},
{
"name": "CVE-2026-42766",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42766"
},
{
"name": "CVE-2026-9076",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9076"
},
{
"name": "CVE-2026-34181",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34181"
},
{
"name": "CVE-2026-42770",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42770"
},
{
"name": "CVE-2026-45445",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45445"
},
{
"name": "CVE-2026-7383",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-7383"
},
{
"name": "CVE-2026-42771",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42771"
},
{
"name": "CVE-2026-42765",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42765"
},
{
"name": "CVE-2026-42769",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42769"
},
{
"name": "CVE-2026-45447",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45447"
},
{
"name": "CVE-2026-45446",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45446"
},
{
"name": "CVE-2026-34183",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34183"
},
{
"name": "CVE-2026-42767",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42767"
},
{
"name": "CVE-2026-42764",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42764"
},
{
"name": "CVE-2026-42768",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42768"
},
{
"name": "CVE-2026-34182",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34182"
}
],
"initial_release_date": "2026-06-10T00:00:00",
"last_revision_date": "2026-06-10T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0717",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-06-10T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
},
{
"description": "Atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans OpenSSL. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code arbitraire \u00e0 distance, un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans OpenSSL",
"vendor_advisories": [
{
"published_at": "2026-06-09",
"title": "Bulletin de s\u00e9curit\u00e9 OpenSSL",
"url": "https://openssl-library.org/news/secadv/20260609.txt"
}
]
}
CVE-2026-34180 (GCVE-0-2026-34180)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:47
VLAI
EPSS
Title
Heap Buffer Over-read in ASN.1 Content Parsing
Summary
Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive
element whose content exceeds 2 gigabytes in length may cause a heap buffer
over-read on 64-bit Unix and Unix-like platforms.
Impact summary: The heap buffer over-read may crash the application (Denial of
Service) or to load into the decoded ASN.1 object contents of memory beyond the
end of the input buffer. More typically such ASN.1 elements would instead be
truncated.
An integer truncation in OpenSSL's ASN.1 decoder causes the content length of
an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the
worst case the truncated length is treated as a request to scan the binary
content for a terminating zero byte, possibly causing OpenSSL to read either
less than or beyond the end of the allocated buffer.
Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or
any other d2i_* decoding function are affected. OpenSSL's own command-line
tools are not vulnerable, as data read through the BIO layer is checked before
it reaches the affected code. The issue only affects 64-bit Unix and Unix-like
platforms; 32-bit platforms and 64-bit Windows are not affected.
The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue,
as the affected code is outside the OpenSSL FIPS module boundary.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
6 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Frank Buss
Viktor Dukhovni
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CVE-2026-34181 (GCVE-0-2026-34181)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 16:02
VLAI
EPSS
Title
PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys
Summary
Issue Summary: The PKCS#12 file processing fails to perform sufficient input
validation for files that use Password-Based Message Authentication Code 1
(PBMAC1) integrity mechanism allowing a certificate and private key forgery.
Impact Summary: An attacker impersonating a user can cause a service reading
PKCS#12 files to accept forged certificates and private keys with a 1 in 256
probability.
If a service accepting PKCS#12 files is using passwords for authenticating
the received files, the attacker can create unencrypted PKCS#12 files that
use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing
them to craft a file that will be accepted with a 1 in 256 probability.
That would then cause the service to accept a certificate and private key
controlled by the attacker.
The FIPS modules are not affected by this issue, as the affected code is
outside the OpenSSL FIPS module boundary.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
5 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Pavol Žáčik (Red Hat)
Alex Gaynor (Anthropic)
Alicja Kario (Red Hat)
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CVE-2026-34182 (GCVE-0-2026-34182)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 15:58
VLAI
EPSS
Title
CMS AuthEnvelopedData Processing May Accept Forged Messages
Summary
Issue Summary: Cryptographic Message Services (CMS) processing fails to perform
sufficient input validation on the cipher and tag length fields of
AuthEnvelopedData containers, leading to various potential compromises.
Impact Summary: Attackers making use of these vulnerabilities may achieve
key-equivalent functionality for a given CMS recipient and/or bypass integrity
validation for a given message.
In one use case, an attacker may send a CMS message containing
AuthEnvelopedData with the cipher specified as a non-AEAD cipher. OpenSSL
erroneously allows this selection, and attempts to decrypt and validate the
message.
An on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData
addressed to the victim can re-emit it with the recipientInfos set left
byte-for-byte intact, so the victim's private key still unwraps the genuine CEK
(the content-encryption key), but with the inner OID rewritten to AES-256-OFB
(Output Feedback Mode, an unauthenticated keystream mode) and with an
attacker-chosen IV and ciphertext. The victim initializes AES-256-OFB under the
real CEK, never consults the MAC field, and CMS_decrypt() returns success.
If the application under attack responds to the attacker with any indicator
showing success or failure of the decryption effort, it is possible for the
attacker to use this as an oracle to obtain key equivalent functionality for the
CEK used for the chosen recipient of the message.
In another use case, an attacker can reduce the tag length of the chosen AEAD
cipher for a given AuthEnvelopedData container to be a single byte long,
allowing an attacker to brute force CMS decryption, producing an integrity
bypass for applications that trust CMS_decrypt() to reject modified content.
The FIPS modules are not affected by this issue.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
6 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Asim Viladi Oglu Manizada
Alex Gaynor (Anthropic)
Ying Dong
Haiyang Huang
Neil Horman
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CVE-2026-34183 (GCVE-0-2026-34183)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 15:51
VLAI
EPSS
Title
Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler
Summary
Issue summary: Remote peer may exhaust heap memory of the QUIC
server or client by flooding it with packets containing PATH_CHALLENGE
frames.
Impact summary: A malicious remote peer can cause an unbounded
memory allocation which can lead to an abnormal termination of the
application acting as a QUIC client or server and a Denial of Service.
A remote peer may exhaust heap memory by flooding the local
QUIC stack with PATH_CHALLENGE frames. The local QUIC stack
allocates a PATH_RESPONSE frame for every PATH_CHALLENGE it receives.
The allocated PATH_RESPONSE frame gets freed only when the remote
peer acknowledges reception of the PATH_RESPONSE frame which will
not be done by a malicious peer.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by
this issue. The QUIC stack is outside of OpenSSL FIPS module
boundary.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1325 - Improperly Controlled Sequential Memory Allocation
Assigner
References
5 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Abhinav Agarwal
Alexandr Nedvedicky
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CVE-2026-35188 (GCVE-0-2026-35188)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 20:02
VLAI
EPSS
Title
Double-free When Checking OCSP Stapled Response
Summary
Issue summary: A malicious server can exploit TLS OCSP stapling by delivering
a crafted response through the status_request extension, triggering a
double-free in the client's certificate verification path.
Impact summary: Successful exploitation allows an attacker to corrupt heap
memory via a double-free, potentially leading to a Denial of Service or
possibly an attacker controlled code execution or other undefined behavior.
If OCSP stapling is enabled and the TLS client connects to a malicious server,
a crafted OCSP stapled response can trigger a double free in the TLS client
when the stapled response is checked.
The OCSP stapling is not enabled by default. Reliable code execution
through a double-free is technically complex and highly environment-dependent
but the Denial of Service impact is straightforward to achieve, warranting
Moderate severity.
No FIPS modules are affected by this issue as the affected code is outside
the OpenSSL FIPS module boundary.
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-415 - Double Free
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://openssl-library.org/news/secadv/20260609.txt | vendor-advisory |
| https://github.com/openssl/openssl/commit/78d0154… | patch |
| https://github.com/openssl/openssl/commit/131145d… | patch |
Impacted products
Date Public
2026-06-09 14:00
Credits
Wang Kenaz (University of Illinois)
Guido Vranken (Aisle Research)
Aaron Grattafiori (Nvidia)
Daniel Kubec
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CVE-2026-42764 (GCVE-0-2026-42764)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:47
VLAI
EPSS
Title
NULL Pointer Dereference in QUIC Server Initial Packet Handling
Summary
Issue summary: Receiving a QUIC initial packet with an invalid token may
trigger a NULL pointer dereference in the OpenSSL QUIC server with
address validation disabled.
Impact summary: NULL pointer dereference typically causes abnormal termination
of the affected QUIC server process and a Denial of Service.
If the address validation is disabled in the OpenSSL QUIC server
implementation, an attacker can crash the server by sending an initial
packet with an invalid or expired token.
By default, the client address validation is enabled in the OpenSSL QUIC server
implementation, which makes the default configuration not vulnerable
to this issue. However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with
the SSL_new_listener() call, the address validation is disabled making the
vulnerable code reachable.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this
issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
4 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Sunwoo Lee (KENTECH)
Hyuk Lim (KENTECH)
Seunghyun Yoon (KENTECH)
Sunwoo Lee (KENTECH)
Hyuk Lim (KENTECH)
Seunghyun Yoon (KENTECH)
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CVE-2026-42765 (GCVE-0-2026-42765)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:48
VLAI
EPSS
Title
NULL Dereference in Certificate Verification with OCSP Checking
Summary
Issue summary: When a partial-chain certificate verification is enabled
together with OCSP response checking for the whole chain, a NULL dereference
will happen if the verified chain does not have a self-signed trusted anchor,
crashing the process.
Impact summary: A NULL pointer dereference can trigger a crash which leads to a
Denial of Service for an application.
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chain, the code always tries to access the next certificate as the issuer.
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anchor, the issuer will be NULL for the last certificate in the chain. A NULL
pointer dereference then happens.
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assigned Low severity to the issue.
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the OpenSSL FIPS module boundary.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://openssl-library.org/news/secadv/20260609.txt | vendor-advisory |
| https://github.com/openssl/openssl/commit/14340b7… | patch |
| https://github.com/openssl/openssl/commit/eb345da… | patch |
Impacted products
Date Public
2026-06-09 14:00
Credits
Joshua Rogers (Aisle Research)
Joshua Rogers (Aisle Research)
Daniel Kubec
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CVE-2026-42766 (GCVE-0-2026-42766)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:48
VLAI
EPSS
Title
Possible NULL Dereference in Password-Based CMS Decryption
Summary
Issue summary: A specially crafted password-encrypted CMS message
can trigger a NULL pointer dereference during CMS decryption.
Impact summary: This NULL pointer dereference leads to an application crash
and a Denial of Service.
The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as
OPTIONAL in the ASN.1 specification and may therefore be absent in specially
crafted inputs. During the password-based CMS decryption the OpenSSL
CMS implementation dereferences this field without first checking whether it
was present.
An attacker who supplies such a CMS message to an application performing
password-based CMS decryption can trigger an application crash, leading to
a Denial of Service.
Applications that process password-encrypted CMS messages may be affected.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this
issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
6 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Mayank Jangid
Kushal Khemka
Hari Priandana
Bhabani Sankar Das
Qifan Zhang (Palo Alto Networks)
Igor Ustinov
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CVE-2026-42767 (GCVE-0-2026-42767)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:48
VLAI
EPSS
Title
NULL Pointer Dereference in CRMF EncryptedValue Decryption
Summary
Issue summary: An attacker-controlled CMP (Certificate Management Protocol)
server could trigger a NULL pointer dereference in a CMP client application.
Impact summary: A NULL pointer dereference causes a crash of the
application and a Denial of Service.
An attacker controlling a CMP server (or acting as a man-in-the-middle) could
craft a CMP response containing a CRMF (Certificate Request Message Format)
CertRepMessage with an EncryptedValue structure where the symmAlg field
has an algorithm OID but no parameters field. When the OpenSSL CMP client
processes this response, the NULL dereference occurs, causing a crash of
the CMP client.
Applications that process untrusted CMP/CRMF messages may be affected.
The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this
issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
6 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Zhanpeng Liu (Tencent Xuanwu Lab)
Guannan Wang (Tencent Xuanwu Lab)
Guancheng Li (Tencent Xuanwu Lab)
Bhabani Sankar Das
Igor Ustinov
Tomáš Mráz
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CVE-2026-42768 (GCVE-0-2026-42768)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:48
VLAI
EPSS
Title
Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()
Summary
Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to
Bleichenbacher-style attack when an attacker is able to provide the CMS or
S/MIME messages and observe the error code and/or decryption output.
Impact summary: The Bleichenbacher-style attack allows an attacker to use the
victim's vulnerable application as a way to decrypt or sign messages with the
victim's private RSA key.
The attack is possible in 2 variants.
1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without
providing the recipient certificate. In this case OpenSSL iterates over every
KeyTransRecipientInfo (KTRI) without stopping at the first success.
An attacker who authors a message with two KTRI entries — the first one
wrapping a real CEK under the victim's public key, the second with an
arbitrary probe ciphertext — obtains opportunity to iterate the 2nd KTRI to
get a valid PKCS#1 v1.5 padding if the error code of the application is
available.
That is a Bleichenbacher oracle (Bleichenbacher, CRYPTO '98): an
adaptive-chosen-ciphertext side channel from which the attacker decrypts any
RSA ciphertext to the victim's key or forges any PKCS#1 v1.5 signature under
it.
2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with
the recipient certificate, and the recipient is not found, a random
key is substituted.
An attacker who authors a message and is able to compare both error code and
the result of the decryption, can mount a Bleichenbacher oracle.
We are not aware of any applications that provide a remote attacker
an opportunity to mount an attack described in these scenarios. We consider
the existence of such application very unlikely, and for this reason this
CVE has been evaluated as Low severity.
To avoid these attacks, when RSA PKCS#1 v1.5 Key Transport is in use, the
invoked EVP_PKEY_decrypt() will use the implicit rejection mechanism described
in draft-irtf-cfrg-rsa-guidance. In previous OpenSSL releases the implicit
rejection was explicitly disabled.
The implicit rejection mechanism always returns a plaintext value,
the symmetric key. This result is deterministic for the ciphertext and the
private key. The length of the decryption result can happen to match the
length of the key of the symmetric cipher that was used for the content
encryption. When a certificate is not provided, the last RecipientInfo
producing a key that looks valid will be used. It may cause getting garbage
content on decryption. As a proper way to deal with this a recipient
certificate has to be provided to identify the particular RecipientInfo for
decryption.
The FIPS modules in 4.0, 3.6, 3.5, and 3.4 are not affected by this issue, as
CMS and S/MIME processing happens outside the OpenSSL FIPS module boundary.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-514 - Covert Channel
Assigner
References
5 references
Impacted products
Date Public
2026-06-09 14:00
Credits
Alex Gaynor (Anthropic)
Dmitry Belyavskiy (Red Hat)
Alicja Kario (Red Hat)
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"value": "Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to\u003cbr\u003eBleichenbacher-style attack when an attacker is able to provide the CMS or\u003cbr\u003eS/MIME messages and observe the error code and/or decryption output.\u003cbr\u003e\u003cbr\u003eImpact summary: The Bleichenbacher-style attack allows an attacker to use the\u003cbr\u003evictim\u0027s vulnerable application as a way to decrypt or sign messages with the\u003cbr\u003evictim\u0027s private RSA key.\u003cbr\u003e\u003cbr\u003eThe attack is possible in 2 variants.\u003cbr\u003e\u003cbr\u003e1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without\u003cbr\u003eproviding the recipient certificate. In this case OpenSSL iterates over every\u003cbr\u003eKeyTransRecipientInfo (KTRI) without stopping at the first success.\u003cbr\u003e\u003cbr\u003eAn attacker who authors a message with two KTRI entries \u2014 the first one\u003cbr\u003ewrapping a real CEK under the victim\u0027s public key, the second with an\u003cbr\u003earbitrary probe ciphertext \u2014 obtains opportunity to iterate the 2nd KTRI to\u003cbr\u003eget a valid PKCS#1 v1.5 padding if the error code of the application is\u003cbr\u003eavailable.\u003cbr\u003e\u003cbr\u003eThat is a Bleichenbacher oracle (Bleichenbacher, CRYPTO \u002798): an\u003cbr\u003eadaptive-chosen-ciphertext side channel from which the attacker decrypts any\u003cbr\u003eRSA ciphertext to the victim\u0027s key or forges any PKCS#1 v1.5 signature under\u003cbr\u003eit.\u003cbr\u003e\u003cbr\u003e2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with\u003cbr\u003ethe recipient certificate, and the recipient is not found, a random\u003cbr\u003ekey is substituted.\u003cbr\u003e\u003cbr\u003eAn attacker who authors a message and is able to compare both error code and\u003cbr\u003ethe result of the decryption, can mount a Bleichenbacher oracle.\u003cbr\u003e\u003cbr\u003eWe are not aware of any applications that provide a remote attacker\u003cbr\u003ean opportunity to mount an attack described in these scenarios. We consider\u003cbr\u003ethe existence of such application very unlikely, and for this reason this\u003cbr\u003eCVE has been evaluated as Low severity.\u003cbr\u003e\u003cbr\u003eTo avoid these attacks, when RSA PKCS#1 v1.5 Key Transport is in use, the\u003cbr\u003einvoked EVP_PKEY_decrypt() will use the implicit rejection mechanism described\u003cbr\u003ein draft-irtf-cfrg-rsa-guidance. In previous OpenSSL releases the implicit\u003cbr\u003erejection was explicitly disabled.\u003cbr\u003e\u003cbr\u003eThe implicit rejection mechanism always returns a plaintext value,\u003cbr\u003ethe symmetric key. This result is deterministic for the ciphertext and the\u003cbr\u003eprivate key. The length of the decryption result can happen to match the\u003cbr\u003elength of the key of the symmetric cipher that was used for the content\u003cbr\u003eencryption. When a certificate is not provided, the last RecipientInfo\u003cbr\u003eproducing a key that looks valid will be used. It may cause getting garbage\u003cbr\u003econtent on decryption. As a proper way to deal with this a recipient\u003cbr\u003ecertificate has to be provided to identify the particular RecipientInfo for\u003cbr\u003edecryption.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 4.0, 3.6, 3.5, and 3.4 are not affected by this issue, as\u003cbr\u003eCMS and S/MIME processing happens outside the OpenSSL FIPS module boundary."
}
],
"value": "Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to\nBleichenbacher-style attack when an attacker is able to provide the CMS or\nS/MIME messages and observe the error code and/or decryption output.\n\nImpact summary: The Bleichenbacher-style attack allows an attacker to use the\nvictim\u0027s vulnerable application as a way to decrypt or sign messages with the\nvictim\u0027s private RSA key.\n\nThe attack is possible in 2 variants.\n\n1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without\nproviding the recipient certificate. In this case OpenSSL iterates over every\nKeyTransRecipientInfo (KTRI) without stopping at the first success.\n\nAn attacker who authors a message with two KTRI entries \u2014 the first one\nwrapping a real CEK under the victim\u0027s public key, the second with an\narbitrary probe ciphertext \u2014 obtains opportunity to iterate the 2nd KTRI to\nget a valid PKCS#1 v1.5 padding if the error code of the application is\navailable.\n\nThat is a Bleichenbacher oracle (Bleichenbacher, CRYPTO \u002798): an\nadaptive-chosen-ciphertext side channel from which the attacker decrypts any\nRSA ciphertext to the victim\u0027s key or forges any PKCS#1 v1.5 signature under\nit.\n\n2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with\nthe recipient certificate, and the recipient is not found, a random\nkey is substituted.\n\nAn attacker who authors a message and is able to compare both error code and\nthe result of the decryption, can mount a Bleichenbacher oracle.\n\nWe are not aware of any applications that provide a remote attacker\nan opportunity to mount an attack described in these scenarios. We consider\nthe existence of such application very unlikely, and for this reason this\nCVE has been evaluated as Low severity.\n\nTo avoid these attacks, when RSA PKCS#1 v1.5 Key Transport is in use, the\ninvoked EVP_PKEY_decrypt() will use the implicit rejection mechanism described\nin draft-irtf-cfrg-rsa-guidance. In previous OpenSSL releases the implicit\nrejection was explicitly disabled.\n\nThe implicit rejection mechanism always returns a plaintext value,\nthe symmetric key. This result is deterministic for the ciphertext and the\nprivate key. The length of the decryption result can happen to match the\nlength of the key of the symmetric cipher that was used for the content\nencryption. When a certificate is not provided, the last RecipientInfo\nproducing a key that looks valid will be used. It may cause getting garbage\ncontent on decryption. As a proper way to deal with this a recipient\ncertificate has to be provided to identify the particular RecipientInfo for\ndecryption.\n\nThe FIPS modules in 4.0, 3.6, 3.5, and 3.4 are not affected by this issue, as\nCMS and S/MIME processing happens outside the OpenSSL FIPS module boundary."
}
],
"metrics": [
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"format": "other",
"other": {
"content": {
"text": "Low"
},
"type": "https://openssl-library.org/policies/general/security-policy/"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-514",
"description": "CWE-514 Covert Channel",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-10T07:48:04.770Z",
"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"shortName": "openssl"
},
"references": [
{
"name": "OpenSSL Advisory",
"tags": [
"vendor-advisory"
],
"url": "https://openssl-library.org/news/secadv/20260609.txt"
},
{
"name": "4.0.1 git commit",
"tags": [
"patch"
],
"url": "https://github.com/openssl/openssl/commit/f04b377be3d821741c86d1f4bf84dee09f3d5c3e"
},
{
"name": "3.6.3 git commit",
"tags": [
"patch"
],
"url": "https://github.com/openssl/openssl/commit/a2ca7b2d73e0ffc1eae183fe6e1741dac767cb4f"
},
{
"name": "3.5.7 git commit",
"tags": [
"patch"
],
"url": "https://github.com/openssl/openssl/commit/bbb151a83041705d9d001ed2f9c12f5523e1b54d"
},
{
"name": "3.4.6 git commit",
"tags": [
"patch"
],
"url": "https://github.com/openssl/openssl/commit/dd68364107a58841c0a2546812518b65d3a23abd"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()",
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"cveMetadata": {
"assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"assignerShortName": "openssl",
"cveId": "CVE-2026-42768",
"datePublished": "2026-06-09T16:03:28.206Z",
"dateReserved": "2026-04-29T09:22:27.969Z",
"dateUpdated": "2026-06-10T07:48:04.770Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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