{"id":"CVE-2026-102268","title":"PyJWT is a Python implementation of JSON Web Token standards","summary":"PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs w…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-347"],"vendor":"pyjwt_project","product":"pyjwt","affected":["pyjwt < 2.14.0"],"patched":["pyjwt 2.14.0"],"published":"2026-09-28","updated":"2026-10-07","sourceUpdated":"2026-10-07T20:25:03.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102268","references":[{"url":"https://github.com/jpadilla/pyjwt/commit/8b4e233a22206b34ec1186e912e75c0b2396ac07","label":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/releases/tag/2.14.0","label":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffc3-869f-jxw9","label":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffc3-869f-jxw9","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102268"},{"url":"https://github.com/advisories/GHSA-ffc3-869f-jxw9"},{"url":"https://github.com/jpadilla/pyjwt"},{"url":"https://pypi.org/project/pyjwt"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102268.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-102268"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542685"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102268"},{"url":"https://access.redhat.com/errata/RHSA-2026:82415"},{"url":"https://access.redhat.com/errata/RHSA-2026:82368"},{"url":"https://access.redhat.com/errata/RHSA-2026:82061"},{"url":"https://access.redhat.com/errata/RHSA-2026:82059"},{"url":"https://access.redhat.com/errata/RHSA-2026:82371"},{"url":"https://access.redhat.com/errata/RHSA-2026:84785"}],"tags":["nvd","exploit-available","cve.org","ghsa","pip","osv","csaf","vex","red-hat"],"epss":0.00236,"epssPercentile":0.14495,"exploits":{"github":1,"githubRepos":["https://github.com/covepseng/cve-2026-102268-poc"],"checkedAt":"2026-10-27T16:53:21.709Z"},"exploitAvailable":true,"aliases":["GHSA-ffc3-869f-jxw9","PYSEC-2026-4145"],"ecosystem":"pip","ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-29T13:59:05.202281Z"},"ingestedAt":"2026-09-28T21:20:54.780Z","slug":"CVE-2026-102268","body":"## Overview\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.\n\n## Affected\n\n- `pyjwt < 2.14.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `pyjwt 2.14.0`\n\n## Package advisory (CVE-2026-102268)\n\nAffected packages:\n\n- `PyJWT <= 2.13.0`\n\nPatched in:\n\n- `PyJWT 2.14.0`\n\nSource: https://github.com/advisories/GHSA-ffc3-869f-jxw9\n\n## Vendor advisories\n\n- **RHSA-2026:82415** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82415)\n- **RHSA-2026:82368** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82368)\n- **RHSA-2026:82061** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82061)\n- **RHSA-2026:82059** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82059)\n- **RHSA-2026:82371** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82371)\n- **Red Hat VEX** · Critical · affected: Lightspeed Core, Red Hat Ansible Automation Platform 2, Red Hat Ceph Storage 4, Red Hat Ceph Storage 7, Red Hat Ceph Storage 9, Red Hat Enterprise Linux 10, … · no fix planned: Red Hat Ceph Storage 4, Red Hat Ceph Storage 7, Red Hat Ceph Storage 9, Lightspeed Core, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102268.json)\n- **RHSA-2026:84785** · Red Hat · fixed in: Red Hat Trusted Artifact Signer 1.4 · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84785)","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":212690,"id":"CVE-2026-102268","ts":1790692641029,"field":"exploit_available","old":"false","new":"true"}]}