CVE catalog
CVE-2026-48524
PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient.get_signing_key() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rat
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.40% · Oct 25, 2026
PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient.get_signing_key() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests. The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. This vulnerability is fixed in 2.13.0.
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 | fixed |
| Debian | pyjwt | forky | 2.15.1-1 | fixed |
| Debian | pyjwt | trixie | 2.10.1-2+deb13u1 | vulnerable |
| Debian | pyjwt | trixie-security | 2.10.1-2+deb13u1 | vulnerable |
| Debian | pyjwt | bookworm | 2.6.0-1+deb12u1 | vulnerable |
| Debian | pyjwt | bookworm-security | 2.6.0-1+deb12u1 | vulnerable |
| Cpe | pyjwt | Not reported | Not reported | vulnerable |
| Cpe | pyjwt | Not reported | 2.13.0 | fixed |
| PyPI | pyjwt | Not reported | 2.13.0 | fixed |
| Ubuntu | pyjwt | noble | 2.7.0-1ubuntu0.2 | fixed |
| Ubuntu | python3-jwt | noble | 2.7.0-1ubuntu0.2 | fixed |
| Ubuntu | pyjwt | 24.04 | 2.7.0-1 | vulnerable |
| Ubuntu | pyjwt | 24.04 | 2.7.0-1ubuntu0.1 | vulnerable |
| Ubuntu | pyjwt | 24.04 | 2.7.0-1ubuntu0.2 | fixed |
| Ubuntu | pyjwt | 25.10 | 2.10.1-2 | vulnerable |
| Ubuntu | pyjwt | 25.10 | 2.10.1-2ubuntu0.1 | vulnerable |
| Ubuntu | pyjwt | 26.04 | 2.10.1-2 | vulnerable |
| Ubuntu | pyjwt | 26.04 | 2.10.1-3 | vulnerable |
| Ubuntu | pyjwt | 26.04 | 2.10.1-3build1 | vulnerable |
| Ubuntu | pyjwt | 26.04 | 2.10.1-4 | vulnerable |
| Ubuntu | pyjwt | 26.04 | 2.10.1-4ubuntu1 | vulnerable |
| Ubuntu | pyjwt | 26.04 | 2.10.1-4ubuntu1.1 | fixed |
| Cpe | pyjwt | Not reported | 2.13.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | pyjwt | source | sid | 2.13.0-1 | not yet assigned | Not reported | [1138191] |
| Debian | pyjwt | source | forky | 2.13.0-1 | not yet assigned | Not reported | [1138191] |
| Debian | pyjwt | source | trixie | (unfixed) | not yet assigned | Not reported | [1138191] |
| Debian | pyjwt | source | bookworm | (unfixed) | not yet assigned | Not reported | [1138191] |
| Cpe | pyjwt | cpe | Not reported | 2.13.0 | Not reported | Not reported | Not reported |
| PyPI | pyjwt | PyPI | Not reported | 2.13.0 | Not reported | GHSA-FHV5-28VV-H8M8 | Not reported |
| Ubuntu | pyjwt | deb | noble | 2.7.0-1ubuntu0.2 | Not reported | Not reported | Not reported |
| Ubuntu | python3-jwt | deb | noble | 2.7.0-1ubuntu0.2 | Not reported | Not reported | Not reported |
| Ubuntu | pyjwt | deb | 24.04 | 2.7.0-1ubuntu0.2 | Not reported | UBUNTU-CVE-2026-48524 | Not reported |
| Ubuntu | pyjwt | deb | 26.04 | 2.10.1-4ubuntu1.1 | Not reported | UBUNTU-CVE-2026-48524 | Not reported |
| Cpe | pyjwt | cpe | Not reported | 2.13.0 | Not reported | NVD-CVE-2026-48524 | Not reported |
Notes
[trixie] pyjwt: Minor issue [bookworm] pyjwt: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-jwt]Affected
Source package: [pyjwt]
Details (4)
2.6.0-1+deb12u1· all · bookwormAffected
nvd · pyjwt · debian · bookworm; nvd · pyjwt · debian · 12
2.6.0-1+deb12u1· all · bookwormAffected
nvd · pyjwt · debian · bookworm; nvd · pyjwt · debian · 12
2.6.0-1+deb12u1· all · bookworm-securityAffected
nvd · pyjwt · debian · bookworm; nvd · pyjwt · debian · 12
2.6.0-1+deb12u1· all · bookworm-securityAffected
nvd · pyjwt · debian · bookworm; nvd · pyjwt · debian · 12
[Debian 13 (Trixie)]
- [python3-jwt]Affected
Source package: [pyjwt]
Details (4)
2.10.1-2+deb13u1· all · trixieAffected
nvd · pyjwt · debian · 13
2.10.1-2+deb13u1· all · trixieAffected
nvd · pyjwt · debian · 13
2.10.1-2+deb13u1· all · trixie-securityAffected
nvd · pyjwt · debian · 13
2.10.1-2+deb13u1· all · trixie-securityAffected
nvd · pyjwt · debian · 13
- [python-jwt-doc]Affected
Source package: [pyjwt]
Details (4)
2.10.1-2+deb13u1· all · trixieAffected
nvd · pyjwt · debian · 13
2.10.1-2+deb13u1· all · trixieAffected
nvd · pyjwt · debian · 13
2.10.1-2+deb13u1· all · trixie-securityAffected
nvd · pyjwt · debian · 13
2.10.1-2+deb13u1· all · trixie-securityAffected
nvd · pyjwt · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://github.com/jpadilla/pyjwt/security/advisories/GHSA-fhv5-28vv-h8m8]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-48524]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-48524]
- [https://osv.dev/vulnerability/GHSA-fhv5-28vv-h8m8]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-48524]
- [https://security-tracker.debian.org/tracker/CVE-2026-48524]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48524.json]
- [https://ubuntu.com/security/notices/USN-8823-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]