CVE-2026-48526
A public proof of concept exists; no exploitation attested.
- Published2026-05-28
- Fixed in2.13.0
- WeaknessCWE-287 · CWE-347
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.
Timeline
dates in UTC- 2026-05-2816:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-48526?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-48526?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.13 | < 2.13.0 | 2.13.0 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- fence-virtdAlmaLinux:10all versions · fixed in 4.16.0-21.el10_2.2and 54 other packages
- fence-virtdAlmaLinux:9all versions · fixed in 4.10.0-110.el9_8.3and 55 other packages
Vendor advisories
Red Hat Security Advisory: Red Hat Quay 3.14.9
Red Hat Security Advisory: Satellite 6.18.8 Async Update
Red Hat Security Advisory: Satellite 6.16.12 Async Update
Red Hat Security Advisory: Satellite 6.17.10 Async Update
Red Hat Security Advisory: Red Hat Quay 3.15.6
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update
5 more advisories
Fix
- Update Pyjwt project pyjwt to 2.13.0
- Vendor fix Red Hat Product Security RHSA-2026:70267 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11458
- Vendor fix Red Hat Product Security RHSA-2026:50263 · 6 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:50223 · 12 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_satellite/6.16/html/updating_red_hat_satellite/index
- Vendor fix Red Hat Product Security RHSA-2026:50222 · 6 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_satellite/6.17/html/updating_red_hat_satellite/index
- Vendor fix Red Hat Product Security RHSA-2026:42796 · 3 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:42142 · 2 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.7#Upgrade
Advisories and patches
- github.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Published
- 2026-05-28
- Last Modified
- 2026-09-10
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-48526?
Is CVE-2026-48526 actively exploited?
What is the CVSS score for CVE-2026-48526?
Running pyjwt? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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