CVE catalog

CVE-2026-49852

DEBIAN-CVE-2026-49852

[CVE catalog]

Severity
Unknown · CVSS 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.17% · Oct 25, 2026

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign and HMACAlgorithm.verify in src/joserfc/_rfc7518/jws_algs.py pass the output of OctKey.get_op_key(...) to hmac.new(...) and OctKey.import_key in src/joserfc/_rfc7518/oct_key.py only emits a SecurityWarning for keys shorter than 14 bytes without rejecting zero-length input. This issue is fixed in version 1.6.8.

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
Debianjoserfc141.6.8-1fixed
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-bp160.3.1fixed
Opensusepython-joserfctumbleweed1.7.2-2.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianjoserfcdeb141.6.8-1Not reportedDEBIAN-CVE-2026-49852Not reported
Opensusepython-joserfcrpmleap 16.01.1.0-bp160.3.1Not reportedOPENSUSE-SU-2026:21263-1Not reported
Opensusepython-joserfcrpmtumbleweed1.7.2-2.1Not reportedOPENSUSE-SU-2026:11183-1Not 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: 1.7.2-2.1

      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: 1.7.2-2.1

      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]