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PYSEC-2026-2268
Vulnerability from pysec - Published: 2026-03-18 00:16 - Updated: 2026-07-13 05:51
VLAI
Details
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
Severity
5.3 (Medium)
Impacted products
| Name | purl | pyopenssl | pkg:pypi/pyopenssl |
|---|
Aliases
{
"affected": [
{
"ecosystem_specific": {},
"package": {
"ecosystem": "PyPI",
"name": "pyopenssl",
"purl": "pkg:pypi/pyopenssl"
},
"ranges": [
{
"events": [
{
"introduced": "0.14"
},
{
"fixed": "26.0.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.14",
"0.15",
"0.15.1",
"16.0.0",
"16.1.0",
"16.2.0",
"17.0.0",
"17.1.0",
"17.2.0",
"17.3.0",
"17.4.0",
"17.5.0",
"18.0.0",
"19.0.0",
"19.1.0",
"20.0.0",
"20.0.1",
"21.0.0",
"22.0.0",
"22.1.0",
"23.0.0",
"23.1.0",
"23.1.1",
"23.2.0",
"23.3.0",
"24.0.0",
"24.1.0",
"24.2.1",
"24.3.0",
"25.0.0",
"25.1.0",
"25.2.0",
"25.3.0"
]
}
],
"aliases": [
"CVE-2026-27448",
"GHSA-vp96-hxj8-p424"
],
"details": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.",
"id": "PYSEC-2026-2268",
"modified": "2026-07-13T05:51:07.105913Z",
"published": "2026-03-18T00:16:19.107Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
},
{
"type": "ADVISORY",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "FIX",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
}
]
}
BREW-GGSHIELD-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:50 – Updated: 2026-09-17 19:50 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "ggshield",
"purl": "pkg:brew/ggshield"
},
"ranges": [
{
"events": [
{
"introduced": "1.50.3"
},
{
"fixed": "1.52.2_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-ggshield-CVE-2026-27448",
"modified": "2026-09-17T19:50:39Z",
"published": "2026-08-13T16:50:00Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-LEXICON-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:02 – Updated: 2026-09-20 11:32 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "lexicon",
"purl": "pkg:brew/lexicon"
},
"ranges": [
{
"events": [
{
"introduced": "3.11.2"
},
{
"fixed": "3.23.2_6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-lexicon-CVE-2026-27448",
"modified": "2026-09-20T11:32:18Z",
"published": "2026-08-13T17:02:43Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-MAGIC-WORMHOLE-CVE-… (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:10 – Updated: 2026-09-24 09:20 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "magic-wormhole",
"purl": "pkg:brew/magic-wormhole"
},
"ranges": [
{
"events": [
{
"introduced": "0.9.2"
},
{
"fixed": "0.23.0_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-magic-wormhole-CVE-2026-27448",
"modified": "2026-09-24T09:20:57Z",
"published": "2026-08-13T17:10:52Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-OCI-CLI-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:19 – Updated: 2026-09-17 17:27 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "oci-cli",
"purl": "pkg:brew/oci-cli"
},
"ranges": [
{
"events": [
{
"introduced": "2.12.7"
},
{
"fixed": "3.79.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-oci-cli-CVE-2026-27448",
"modified": "2026-09-17T17:27:02Z",
"published": "2026-08-13T17:19:22Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-OPENSTACKCLIENT-CVE… (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:24 – Updated: 2026-09-10 00:45 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "openstackclient",
"purl": "pkg:brew/openstackclient"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "10.2.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-openstackclient-CVE-2026-27448",
"modified": "2026-09-10T00:45:16Z",
"published": "2026-08-13T17:24:07Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-POCSUITE3-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:28 – Updated: 2026-09-10 00:58 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.2.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "pocsuite3",
"purl": "pkg:brew/pocsuite3"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.0_10"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.2.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.2.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-pocsuite3-CVE-2026-27448",
"modified": "2026-09-10T00:58:01Z",
"published": "2026-08-13T17:28:25Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-PROWLER-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:29 – Updated: 2026-09-17 18:54 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "prowler",
"purl": "pkg:brew/prowler"
},
"ranges": [
{
"events": [
{
"introduced": "5.13.0"
},
{
"fixed": "5.23.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-prowler-CVE-2026-27448",
"modified": "2026-09-17T18:54:08Z",
"published": "2026-08-13T17:29:23Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-SCOUTSUITE-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-09-17 19:22 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "scoutsuite",
"purl": "pkg:brew/scoutsuite"
},
"ranges": [
{
"events": [
{
"introduced": "5.13.0"
},
{
"fixed": "5.14.0_11"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-scoutsuite-CVE-2026-27448",
"modified": "2026-09-17T19:22:33Z",
"published": "2026-08-13T17:34:19Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-SCRAPY-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-09-17 19:33 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.4.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "scrapy",
"purl": "pkg:brew/scrapy"
},
"ranges": [
{
"events": [
{
"introduced": "2.9.0"
},
{
"fixed": "2.14.2_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.4.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.4.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-scrapy-CVE-2026-27448",
"modified": "2026-09-17T19:33:08Z",
"published": "2026-08-13T17:34:19Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
BREW-SHOWCERT-CVE-2026-27448 (GHSA-VP96-HXJ8-P424)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-09-17 17:24 – Source website
VLAI
Summary
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Details
If a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.
Unhandled exceptions now result in rejecting the connection.
Credit to Leury Castillo for reporting this issue.
Severity
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "pyopenssl",
"resource_purl": "pkg:pypi/pyopenssl@26.3.0",
"upstream_fixed_in": "26.0.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "showcert",
"purl": "pkg:brew/showcert"
},
"ranges": [
{
"events": [
{
"introduced": "0.2.12"
},
{
"fixed": "0.4.16_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/pyopenssl@26.3.0",
"name": "pyopenssl",
"resource": "pyopenssl",
"strategy": "registry",
"subject_version": "26.3.0"
}
]
},
"details": "If a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it.\n\nUnhandled exceptions now result in rejecting the connection.\n\nCredit to **Leury Castillo** for reporting this issue.",
"id": "BREW-showcert-CVE-2026-27448",
"modified": "2026-09-17T17:24:23Z",
"published": "2026-08-13T17:34:39Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27448"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyca/pyopenssl"
},
{
"type": "WEB",
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback",
"upstream": [
"GHSA-vp96-hxj8-p424",
"CVE-2026-27448",
"PYSEC-2026-2268"
]
}
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Trend slope:
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(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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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