CVE catalog

CVE-2026-62995

DEBIAN-CVE-2026-62995

[CVE catalog]

Severity
Medium · CVSS 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.14% · Oct 25, 2026

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding (==) which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when consumed by joserfc. Depending on this application this might or not be an issue. This could lead to bypass of token revocation or anti-replay protection when implemented as a deny list of tokens or a deny list of token hashes. Note that ECDSA JWS are always malleable because of the malleability of ECDSA signatures (first test case in the code bellow). This makes a scheme which assumes that JWTs are not malleable brittle. However for other signatures (or MAC) schemes it might make sense to assume non malleability of the token. This issue has been fixed in version 1.7.2.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianjoserfc131.1.0-1vulnerable
Debianjoserfc131.2.0-1vulnerable
Debianjoserfc131.2.2-1vulnerable
Debianjoserfc131.3.1-1vulnerable
Debianjoserfc131.3.2-1vulnerable
Debianjoserfc131.3.4-1vulnerable
Debianjoserfc131.4.0-1vulnerable
Debianjoserfc131.4.1-1vulnerable
Debianjoserfc131.4.3-1vulnerable
Debianjoserfc131.5.0-1vulnerable
Debianjoserfc131.6.0-1vulnerable
Debianjoserfc131.6.1-1vulnerable
Debianjoserfc131.6.2-1vulnerable
Debianjoserfc131.6.3-1vulnerable
Debianjoserfc131.6.4-1vulnerable
Debianjoserfc131.6.5-1vulnerable
Debianjoserfc131.6.8-1vulnerable
Debianjoserfc131.7.0-1vulnerable
Debianjoserfc131.7.1-1vulnerable
Debianjoserfc131.7.2-1vulnerable
Debianjoserfc131.7.3-1vulnerable
Debianjoserfc131.7.4-1vulnerable
Debianjoserfc131.7.5-1vulnerable
Debianjoserfc141.1.0-1vulnerable
Debianjoserfc141.2.0-1vulnerable
Debianjoserfc141.2.2-1vulnerable
Debianjoserfc141.3.1-1vulnerable
Debianjoserfc141.3.2-1vulnerable
Debianjoserfc141.3.4-1vulnerable
Debianjoserfc141.4.0-1vulnerable
Debianjoserfc141.4.1-1vulnerable
Debianjoserfc141.4.3-1vulnerable
Debianjoserfc141.5.0-1vulnerable
Debianjoserfc141.6.0-1vulnerable
Debianjoserfc141.6.1-1vulnerable
Debianjoserfc141.6.2-1vulnerable
Debianjoserfc141.6.3-1vulnerable
Debianjoserfc141.6.4-1vulnerable
Debianjoserfc141.6.5-1vulnerable
Debianjoserfc141.6.8-1vulnerable
Debianjoserfc141.7.0-1vulnerable
Debianjoserfc141.7.1-1vulnerable
Debianjoserfc141.7.2-1fixed
Ubuntujoserfc26.041.2.2-1vulnerable
Ubuntujoserfc26.041.4.0-1vulnerable
Ubuntujoserfc26.041.4.1-1vulnerable
Ubuntujoserfc26.041.4.3-1vulnerable
Ubuntujoserfc26.041.5.0-1vulnerable
Ubuntujoserfc26.041.6.2-1vulnerable
Opensusepython-joserfcleap 16.01.1.0-bp160.4.1fixed
Opensusepython-joserfctumbleweed1.7.4-2.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianjoserfcdeb141.7.2-1Not reportedDEBIAN-CVE-2026-62995Not reported
Opensusepython-joserfcrpmleap 16.01.1.0-bp160.4.1Not reportedOPENSUSE-SU-2026:21515-1Not reported
Opensusepython-joserfcrpmtumbleweed1.7.4-2.1Not reportedOPENSUSE-SU-2026:11423-1Not reported

OpenFactory catalog packages

[Debian 13 (Trixie)]

  • [python3-joserfc]Affected

    Source package: [joserfc]

    Details (2)

    • 1.1.0-1 · all · trixie

      Affected

      pypi · joserfc · debian · 13

    • 1.1.0-1 · all · trixie

      Affected

      pypi · joserfc · debian · 13

[openSUSE Tumbleweed]

  • [python313-joserfc]Unknown

    Source package: [python-joserfc]

    Details (1)

    • 1.7.4-2.1 · noarch · tumbleweed

      Unknown · Fixed: 1.7.4-2.1

      Version impact unknown

      pypi · python-joserfc · opensuse · tumbleweed

  • [python314-joserfc]Unknown

    Source package: [python-joserfc]

    Details (1)

    • 1.7.4-2.1 · noarch · tumbleweed

      Unknown · Fixed: 1.7.4-2.1

      Version impact unknown

      pypi · python-joserfc · opensuse · tumbleweed

Observed:

References

[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]