joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. in versions 1.7.1 and prior, joserfc accepts JWTs with trailing padding (==) which are not conforming to the JOSE specifications. This leads to malleability of the JWTs when consumed by joserfc. Depending on this application this might or not be an issue. This could lead to bypass of token revocation or anti-replay protection when implemented as a deny list of tokens or a deny list of token hashes. Note that ECDSA JWS are always malleable because of the malleability of ECDSA signatures (first test case in the code bellow). This makes a scheme which assumes that JWTs are not malleable brittle. However for other signatures (or MAC) schemes it might make sense to assume non malleability of the token. This issue has been fixed in version 1.7.2.
CVE-2026-62995
This low-severity CVE scores 2.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 99% 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).
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 2.3
- EG Score
- 2.3(medium)
- EG Risk
- 25(Track)EG Risk 25/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity23% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 1%
- KEV
- Not listed
Published
July 29, 2026
Last Modified
July 30, 2026
References (1)
- security-advisories@githubhttps://github.com/authlib/joserfc/security/advisories/GHSA-5jhw-7jv7-qcqq
Vendor Advisories for CVE-2026-62995(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | jaeger-main-2.20.0-0.8.hum1 | 2026-07-30 | redhat |
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
(2 across 2 ecosystems)
Debian:13(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| joserfc | 1.1.0-1 ... 1.7.4-1 (22 versions) | — | — |
Debian:14(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| joserfc | 1.1.0-1 ... 1.7.1-1 (19 versions) | 1.7.2-1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 32× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-15 01:30 UTCEPSS rescore
- 2026-08-14 18:01 UTCEG score recompute
- 2026-08-14 18:01 UTCVendor advisory
- 2026-08-13 22:00 UTCEPSS rescore
- 2026-08-12 13:51 UTCEPSS rescore
- 2026-08-11 18:28 UTCEG score recompute
- 2026-08-11 18:28 UTCVendor advisory
- 2026-08-09 13:47 UTCEPSS rescore
- 2026-08-08 18:54 UTCEG score recompute
- 2026-08-08 18:54 UTCVendor advisory
- 2026-08-08 16:37 UTCEPSS rescore
- 2026-08-06 13:47 UTCEPSS rescore
- 2026-08-05 19:20 UTCEG score recompute
- 2026-08-05 19:20 UTCVendor advisory
- 2026-08-05 19:17 UTCEPSS rescore
- 2026-08-05 19:17 UTCEPSS rescore
- 2026-08-04 15:10 UTCEPSS rescore
- 2026-08-04 10:39 UTCEPSS rescore
- 2026-08-03 10:36 UTCEPSS rescore
- 2026-08-02 19:47 UTCEG score recompute
- 2026-08-02 19:47 UTCVendor advisory
- 2026-08-01 04:16 UTCEPSS rescore
- 2026-07-30 20:13 UTCEG score recompute
- 2026-07-30 20:13 UTCVendor advisory
- 2026-07-30 16:28 UTCEPSS rescore
Show 7 moreShow fewer
- 2026-07-30 15:38 UTCEG score recompute
- 2026-07-30 15:38 UTCVendor advisory
- 2026-07-30 15:00 UTCEG score recompute
- 2026-07-30 15:00 UTCVendor advisory
- 2026-07-29 19:32 UTCEG score recompute
- 2026-07-29 18:34 UTCEG score recompute
- 2026-07-29 18:32 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-62995?
When was CVE-2026-62995 disclosed?
Is CVE-2026-62995 actively exploited?
What is the CVSS score of CVE-2026-62995?
How do I remediate CVE-2026-62995?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-62995
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