CVE catalog

CVE-2024-53861

pyjwt: CVE-2024-53861

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Nov 29, 2024, 6:43:07 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.83% · Oct 25, 2026

pyjwt is a JSON Web Token implementation in Python. An incorrect string comparison is run for `iss` checking, resulting in `"acb"` being accepted for `"_abc_"`. This is a bug introduced in version 2.10.0: checking the "iss" claim changed from `isinstance(issuer, list)` to `isinstance(issuer, Sequence)`. Since str is a Sequnce, but not a list, `in` is also used for string comparison. This results in `if "abc" not in "__abcd__":` being checked instead of `if "abc" != "__abc__":`. Signature checks are still present so real world impact is likely limited to denial of service scenarios. This issue has been patched in version 2.10.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Vulnerable and fixed packages

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

Distribution	Package	Release	Version	Status
Debian	pyjwt	sid	`2.15.1-1`	not affected
Debian	pyjwt	forky	`2.15.1-1`	not affected
Debian	pyjwt	trixie	`2.10.1-2+deb13u1`	not affected
Debian	pyjwt	trixie-security	`2.10.1-2+deb13u1`	not affected
Debian	pyjwt	bookworm	`2.6.0-1+deb12u1`	not affected
Debian	pyjwt	bookworm-security	`2.6.0-1+deb12u1`	not affected
Suse	python-PyJWT	linux micro 6.1	`2.12.1-slfo.1.1_1.1`	fixed
Opensuse	python-PyJWT	tumbleweed	`2.10.1-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	pyjwt	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	pyjwt	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	pyjwt	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	pyjwt	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Suse	python-PyJWT	rpm	linux micro 6.1	`2.12.1-slfo.1.1_1.1`	Not reported	SUSE-SU-2026:20879-1	Not reported
Opensuse	python-PyJWT	rpm	tumbleweed	`2.10.1-1.1`	Not reported	OPENSUSE-SU-2024:14540-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[python313-PyJWT]Unknown
Source package: [python-PyJWT]
Details (1)
- 2.13.0-1.2 · noarch · tumbleweed
  Unknown · Fixed: 2.10.1-1.1
  Version impact unknown
  dsa · python-PyJWT · opensuse · tumbleweed
[python314-PyJWT]Unknown
Source package: [python-PyJWT]
Details (1)
- 2.13.0-1.2 · noarch · tumbleweed
  Unknown · Fixed: 2.10.1-1.1
  Version impact unknown
  dsa · python-PyJWT · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[python3-jwt]Not affected
Source package: [pyjwt]
Details (4)
- 2.6.0-1+deb12u1 · all · bookworm
  Not affected
  dsa · pyjwt · debian · bookworm
- 2.6.0-1+deb12u1 · all · bookworm
  Not affected
  dsa · pyjwt · debian · bookworm
- 2.6.0-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · pyjwt · debian · bookworm
- 2.6.0-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · pyjwt · debian · bookworm

Observed: Oct 27, 2026, 6:46:50 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]