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Vulnerability from cleanstart
Published
2026-07-30 07:10
Modified
2026-07-30 09:38
Summary
Security fixes in curl 8.0.0-r0
Details
Package curl version 8.0.0-r0 fixes 6 vulnerabilities: CVE-2023-27533, CVE-2023-27534, CVE-2023-27535, CVE-2023-27536, CVE-2023-27537...
References
| URL | Type | ||||
|---|---|---|---|---|---|
|
|||||
{
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{
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}
],
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]
}
],
"credits": [],
"database_specific": {},
"details": "Package curl version 8.0.0-r0 fixes 6 vulnerabilities: CVE-2023-27533, CVE-2023-27534, CVE-2023-27535, CVE-2023-27536, CVE-2023-27537...",
"id": "CLEANSTART-2026-RP87853",
"modified": "2026-07-30T09:38:43Z",
"published": "2026-07-30T07:10:53Z",
"references": [
{
"type": "WEB",
"url": "https://curl.se/"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes in curl 8.0.0-r0",
"upstream": [
"CVE-2023-27533",
"CVE-2023-27534",
"CVE-2023-27535",
"CVE-2023-27536",
"CVE-2023-27537",
"CVE-2023-27538"
]
}
CVE-2023-27533 (GCVE-0-2023-27533)
Vulnerability from cvelistv5 – Published: 2023-03-30 00:00 – Updated: 2026-02-13 20:09
VLAI
EPSS
VEX
Summary
A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-75 - Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) (CWE-75)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1891474 | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2023042… | |
| https://lists.debian.org/debian-lts-announce/2023… | mailing-list |
| https://security.gentoo.org/glsa/202310-12 | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
Fixed in 8.0.0
|
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CVE-2023-27534 (GCVE-0-2023-27534)
Vulnerability from cvelistv5 – Published: 2023-03-30 00:00 – Updated: 2025-04-23 16:23
VLAI
EPSS
VEX
Summary
A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user's home directory. Attackers can exploit this flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a server with a specific user.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Path Traversal (CWE-22)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1892351 | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2023042… | |
| https://security.gentoo.org/glsa/202310-12 | vendor-advisory |
| https://lists.debian.org/debian-lts-announce/2024… | mailing-list |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
Fixed in 8.0.0
|
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CVE-2023-27535 (GCVE-0-2023-27535)
Vulnerability from cvelistv5 – Published: 2023-03-30 00:00 – Updated: 2025-06-09 14:47
VLAI
EPSS
VEX
Summary
An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-305 - Authentication Bypass by Primary Weakness (CWE-305)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1892780 | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2023042… | |
| https://lists.debian.org/debian-lts-announce/2023… | mailing-list |
| https://security.gentoo.org/glsa/202310-12 | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
Fixed in 8.0.0
|
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CVE-2023-27536 (GCVE-0-2023-27536)
Vulnerability from cvelistv5 – Published: 2023-03-30 00:00 – Updated: 2025-02-14 15:39
VLAI
EPSS
VEX
Summary
An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-305 - Authentication Bypass by Primary Weakness (CWE-305)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1895135 | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2023042… | |
| https://lists.debian.org/debian-lts-announce/2023… | mailing-list |
| https://security.gentoo.org/glsa/202310-12 | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
Fixed in 8.0.0
|
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"name": "FEDORA-2023-7e7414e64d",
"tags": [
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"x_transferred"
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36NBD5YLJXXEDZLDGNFCERWRYJQ6LAQW/"
},
{
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"url": "https://security.netapp.com/advisory/ntap-20230420-0010/"
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{
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],
"title": "CVE Program Container"
},
{
"metrics": [
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"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2023-27536",
"options": [
{
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},
{
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},
{
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}
],
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}
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"cveMetadata": {
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"datePublished": "2023-03-30T00:00:00.000Z",
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},
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}
CVE-2023-27537 (GCVE-0-2023-27537)
Vulnerability from cvelistv5 – Published: 2023-03-30 00:00 – Updated: 2024-08-02 12:16
VLAI
EPSS
VEX
Summary
A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.
Severity
No CVSS data available.
CWE
- CWE-415 - Double Free (CWE-415)
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
Fixed in 8.0.0
|
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},
"references": [
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{
"url": "https://security.netapp.com/advisory/ntap-20230420-0010/"
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CVE-2023-27538 (GCVE-0-2023-27538)
Vulnerability from cvelistv5 – Published: 2023-03-30 00:00 – Updated: 2025-06-09 14:52
VLAI
EPSS
VEX
Summary
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Severity
7.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-305 - Authentication Bypass by Primary Weakness (CWE-305)
Assigner
References
4 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
Fixed in 8.0.0
|
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"x_transferred"
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],
"title": "CVE Program Container"
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{
"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
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"id": "CVE-2023-27538",
"options": [
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"Exploitation": "none"
},
{
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},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-06-09T14:52:04.392274Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"title": "CISA ADP Vulnrichment"
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"cna": {
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],
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}
],
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{
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},
{
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"cveMetadata": {
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Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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