{"id":"CVE-2026-101918","title":"PyJWT is a Python implementation of JSON Web Token standards","summary":"PyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacke…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-248"],"vendor":"pyjwt_project","product":"pyjwt","affected":["pyjwt >= 2.0.0, < 2.15.0"],"patched":["pyjwt 2.15.0"],"published":"2026-09-28","updated":"2026-10-07","sourceUpdated":"2026-10-07T20:59:17.860","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101918","references":[{"url":"https://github.com/jpadilla/pyjwt/commit/5fde08a6cf906aa7698de2d6391d88b73006b17b","label":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/releases/tag/2.15.0","label":"security-advisories@github.com"},{"url":"https://github.com/jpadilla/pyjwt/security/advisories/GHSA-42vr-xj54-vc7v","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101918.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-101918"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542668"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-101918"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101918"},{"url":"https://github.com/advisories/GHSA-42vr-xj54-vc7v"},{"url":"https://github.com/jpadilla/pyjwt"},{"url":"https://pypi.org/project/pyjwt"},{"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"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","ghsa","pip","osv"],"epss":0.00413,"epssPercentile":0.35394,"aliases":["GHSA-42vr-xj54-vc7v","PYSEC-2026-4141"],"ecosystem":"pip","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-29T13:55:59.459735Z"},"ingestedAt":"2026-09-28T21:20:54.778Z","slug":"CVE-2026-101918","body":"## Overview\n\nPyJWT is a Python implementation of JSON Web Token standards. From 2.0.0a1 until 2.15.0, PyJWT PyJWKClient.get_signing_key_from_jwt is affected because payload parser catches ValueError but not RecursionError. This occurs when an attacker-controlled recursively nested payload reaches json.loads. As a result, documented PyJWT exception handling does not contain the failure. Consequently, an unauthenticated request can raise an exception that may produce an HTTP 500 response. The advisory-defined affected implementation also includes jwt/api_jwt.py, verify_signature=False. This issue is fixed in version 2.15.0.\n\n## Affected\n\n- `pyjwt >= 2.0.0, < 2.15.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `pyjwt 2.15.0`\n\n## Package advisory (CVE-2026-101918)\n\nAffected packages:\n\n- `PyJWT >= 2.0.0a1, <= 2.14.0`\n\nPatched in:\n\n- `PyJWT 2.15.0`\n\nSource: https://github.com/advisories/GHSA-42vr-xj54-vc7v\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Ansible Automation Orchestrator 2026, Confidential Compute Attestation, Fence Agents Remediation Operator, Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, … · no fix planned: Ansible Automation Orchestrator 2026, Confidential Compute Attestation, Fence Agents Remediation Operator, Lightspeed Core, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101918.json)\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)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":212689,"id":"CVE-2026-101918","ts":1790692640800,"field":"exploit_available","old":"false","new":"true"}]}