PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.
CVE-2026-32597
HIGHPre-NVD 7.57.5—Elevated
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 18.5%
- KEV
- Not listed
Published
March 13, 2026
Last Modified
July 10, 2026
Advisory Details (2)
Auto-updated May 6, 2026🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available
PyJWT accepts unknown `crit` header extensions · Advisory · jpadilla/pyjwt · GitHub
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9fgeneric Patch Available
[SECURITY] [DLA 4564-1] pyjwt security update
https://lists.debian.org/debian-lts-announce/2026/05/msg00008.htmlVendor Advisories for CVE-2026-32597(20)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:37275Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.3.5 - Red Hat OpenShift AI
- RHSA-2026:26226Red Hat Product SecurityHigh
Red Hat Security Advisory: General availability of the satellite/iop-host-inventory-rhel9 container image
- RHSA-2026:24977Red Hat Product SecurityHigh
Red Hat Security Advisory: RHOAI 2.25.7 - Red Hat OpenShift AI
- RHSA-2026:22330Red Hat Product SecurityHigh
Red Hat Security Advisory: fence-agents security update
- RHSA-2026:21517Red Hat Product SecurityHigh
Red Hat Security Advisory: fence-agents security update
- RHSA-2026:21431Red Hat Product SecurityHigh
Red Hat Security Advisory: fence-agents security update
- RHSA-2026:19712Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.3.3 - Red Hat OpenShift AI
- RHSA-2026:19355Red Hat Product SecurityHigh
Red Hat Security Advisory: fence-agents security update
- +12 more
Patch Availability(27)
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| pyjwt | 0.1.1 ... 2.9.0 (52 versions) | 2.12.0 | — |
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(7)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
- Red HatRHSA-2026:10140IMPORTANT2026-03-12
RHSA-2026:10140 — Important
- Red HatRHSA-2026:6568IMPORTANT2026-03-12
RHSA-2026:6568 — Important
- Red HatRHSA-2026:6720IMPORTANT2026-03-12
RHSA-2026:6720 — Important
- Red HatRHSA-2026:6912IMPORTANT2026-03-12
RHSA-2026:6912 — Important
- Red HatRHSA-2026:6926IMPORTANT2026-03-12
RHSA-2026:6926 — Important
- Red HatRHSA-2026:8437IMPORTANT2026-03-12
RHSA-2026:8437 — Important
- Red HatRHSA-2026:8746IMPORTANT2026-03-12
RHSA-2026:8746 — Important
Frequently asked(5)
What is CVE-2026-32597?
CVE-2026-32597 is a high vulnerability published on March 13, 2026. PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting…
When was CVE-2026-32597 disclosed?
CVE-2026-32597 was first published in the National Vulnerability Database on March 13, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-32597 actively exploited?
CVE-2026-32597 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-32597?
CVE-2026-32597 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-32597?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-32597, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-32597
Is Your Infrastructure Affected by CVE-2026-32597?
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