OESA-2026-1731

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-1731
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-1731.json
JSON Data
https://api.test.osv.dev/v1/vulns/OESA-2026-1731
Upstream
Published
2026-03-27T14:03:54Z
Modified
2026-03-27T14:18:59.428248Z
Summary
pyOpenSSL security update
Details

pyOpenSSL is a rather thin wrapper around (a subset of) the OpenSSL library. With thin wrapper we mean that a lot of the object methods do nothing more than calling a corresponding function in the OpenSSL library.

Security Fix(es):

A security vulnerability exists in the PyOpenSSL library's set_tlsext_servername_callback function. When a user-provided callback function raises an unhandled exception, the connection would still be accepted. If a user relies on this callback for any security-sensitive behavior (such as server name-based access control or certificate validation), this vulnerability could allow the security mechanism to be bypassed, potentially permitting unauthorized connections or access.(CVE-2026-27448)

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to set_cookie_generate_callback returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.(CVE-2026-27459)

Database specific 
{
    "severity": "Critical"
}
References

Affected packages

openEuler:24.03-LTS-SP3 / pyOpenSSL

Package

Name
pyOpenSSL
Purl
pkg:rpm/openEuler/pyOpenSSL&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
24.0.0-3.oe2403sp3

Ecosystem specific 

{
    "src": [
        "pyOpenSSL-24.0.0-3.oe2403sp3.src.rpm"
    ],
    "noarch": [
        "pyOpenSSL-help-24.0.0-3.oe2403sp3.noarch.rpm",
        "python3-pyOpenSSL-24.0.0-3.oe2403sp3.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-1731.json"