CVE-2026-45447 (GCVE-0-2026-45447)

Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-08-25 12:05
VLAI
Title
Heap Use-After-Free in the PKCS7_verify() Function
Summary
Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition. In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution. Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing 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
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 03:59 UTC
CWE
Assigner
References
URL Tags
https://openssl-library.org/news/secadv/20260609.txt vendor-advisory
https://github.com/openssl/openssl/commit/3aad5eb… patch
https://github.com/openssl/openssl/commit/c505d75… patch
https://github.com/openssl/openssl/commit/7d4a980… patch
https://github.com/openssl/openssl/commit/a541ae8… patch
https://github.com/openssl/openssl/commit/9dfd688… patch
https://access.redhat.com/security/cve/CVE-2026-45447 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2481898 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:58563 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25237 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36215 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36217 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39012 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39009 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35869 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44438 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25239 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26275 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:39981 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47737 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34102 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:58981 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26319 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47735 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: 4.0.0 , < 4.0.1 (semver)
Affected: 3.6.0 , < 3.6.3 (semver)
Affected: 3.5.0 , < 3.5.7 (semver)
Affected: 3.4.0 , < 3.4.6 (semver)
Affected: 3.0.0 , < 3.0.21 (semver)
Affected: 1.1.1 , < 1.1.1zh (custom)
Affected: 1.0.2 , < 1.0.2zq (custom)
guessed Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10 Unaffected: 1:3.5.5-4.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 1:1.0.2k-26.el7_9.2 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 1:1.0.2o-4.el8_10.3 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 1:1.1.1k-16.el8_6 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 1:1.1.1k-16.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 1:1.0.2o-4.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 1:1.1.1k-16.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 1:1.0.2o-4.el8_8.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 1:1.1.1k-16.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 1:3.5.5-4.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 1:1.1.1k-5.el9_8.4 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 1:1.1.1k-4.el9_2.2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 1:1.1.1k-5.el9_4.3 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 1:1.1.1k-5.el9_6.3 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Cost Management Metrics Operator 4 Unaffected: 1783539156 , < * (rpm)
    cpe:/a:redhat:cost_management:4::el9
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Red Hat multicluster engine for Kubernetes 2.8 Unaffected: 1785078604 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.8::el9
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 Unaffected: 1785078581 , < * (rpm)
    cpe:/a:redhat:acm:2.13::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1782159791 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1782166952 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Insights proxy 1.5 Unaffected: 1782890503 , < * (rpm)
    cpe:/a:redhat:insights_proxy:1.5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525684 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525671 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525693 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1781525739 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Date Public
2026-06-09 14:00
Credits
Thai Duong (Calif.io in collaboration with Claude and Anthropic Research) Igor Ustinov
Show details on NVD website
To clipboard 

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      "title": "Heap Use-After-Free in the PKCS7_verify() Function",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-45447.json",
      "version": "5"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45447\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2026-06-09T17:17:19.277\",\"lastModified\":\"2026-08-25T13:19:13.033\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Issue summary: A specially crafted PKCS#7 or S/MIME signed message could\\ntrigger a use-after-free during PKCS#7 signature verification.\\n\\nImpact summary: A use-after-free may result in process crashes, heap\\ncorruption, or potentially remote code execution.\\n\\nWhen processing a PKCS#7 or S/MIME signed message, if the SignedData\\ndigestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may\\nincorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent\\nuse of the BIO by the calling application results in a use-after-free\\ncondition.\\n\\nIn the common case this occurs when the application later calls\\nBIO_free() on the BIO originally passed to PKCS7_verify(). Depending\\non allocator behavior and application-specific BIO usage patterns, this\\nmay result in a crash or other memory corruption. In some application\\ncontexts this may potentially be exploitable for remote code execution.\\n\\nApplications that process PKCS#7 or S/MIME signed messages using OpenSSL\\nPKCS#7 APIs may be affected. Applications using the CMS APIs for this\\nprocessing are not affected.\\n\\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\"},{\"lang\":\"es\",\"value\":\"Resumen del problema: Un mensaje firmado PKCS#7 o S/MIME especialmente dise\u00f1ado podr\u00eda desencadenar un uso despu\u00e9s de liberaci\u00f3n durante la verificaci\u00f3n de firma PKCS#7.\\n\\nResumen del impacto: Un uso despu\u00e9s de liberaci\u00f3n puede resultar en ca\u00eddas de proceso, corrupci\u00f3n de heap o potencialmente ejecuci\u00f3n remota de c\u00f3digo.\\n\\nAl procesar un mensaje firmado PKCS#7 o S/MIME, si el campo digestAlgorithms de SignedData est\u00e1 presente como un SET ASN.1 vac\u00edo, OpenSSL puede liberar incorrectamente un BIO propiedad del llamador durante PKCS7_verify(). Un uso posterior del BIO por la aplicaci\u00f3n llamadora resulta en una condici\u00f3n de uso despu\u00e9s de liberaci\u00f3n.\\n\\nEn el caso com\u00fan, esto ocurre cuando la aplicaci\u00f3n llama posteriormente a BIO_free() en el BIO pasado originalmente a PKCS7_verify(). Dependiendo del comportamiento del asignador y de los patrones de uso de BIO espec\u00edficos de la aplicaci\u00f3n, esto puede resultar en una ca\u00edda u otra corrupci\u00f3n de memoria. En algunos contextos de aplicaci\u00f3n, esto podr\u00eda ser potencialmente explotable para ejecuci\u00f3n remota de c\u00f3digo.\\n\\nLas aplicaciones que procesan mensajes firmados PKCS#7 o S/MIME utilizando las APIs PKCS#7 de OpenSSL pueden verse afectadas. Las aplicaciones que utilizan las APIs CMS para este procesamiento no se ven afectadas.\\n\\nLos m\u00f3dulos FIPS en 4.0, 3.6, 3.5, 3.4 y 3.0 no se ven afectados por este problema, ya que el c\u00f3digo afectado est\u00e1 fuera del l\u00edmite del m\u00f3dulo FIPS de 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Applications using the CMS APIs for this\\nprocessing are not affected.\\n\\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: A specially crafted PKCS#7 or S/MIME signed message could\u003cbr\u003etrigger a use-after-free during PKCS#7 signature verification.\u003cbr\u003e\u003cbr\u003eImpact summary: A use-after-free may result in process crashes, heap\u003cbr\u003ecorruption, or potentially remote code execution.\u003cbr\u003e\u003cbr\u003eWhen processing a PKCS#7 or S/MIME signed message, if the SignedData\u003cbr\u003edigestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may\u003cbr\u003eincorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent\u003cbr\u003euse of the BIO by the calling application results in a use-after-free\u003cbr\u003econdition.\u003cbr\u003e\u003cbr\u003eIn the common case this occurs when the application later calls\u003cbr\u003eBIO_free() on the BIO originally passed to PKCS7_verify(). Depending\u003cbr\u003eon allocator behavior and application-specific BIO usage patterns, this\u003cbr\u003emay result in a crash or other memory corruption. In some application\u003cbr\u003econtexts this may potentially be exploitable for remote code execution.\u003cbr\u003e\u003cbr\u003eApplications that process PKCS#7 or S/MIME signed messages using OpenSSL\u003cbr\u003ePKCS#7 APIs may be affected. Applications using the CMS APIs for this\u003cbr\u003eprocessing are not affected.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\u003cbr\u003eissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-06-10T07:48:15.381Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-45447\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-25T12:05:39.415Z\", \"dateReserved\": \"2026-05-12T14:34:06.277Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-06-09T16:03:32.914Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.