CVE-2026-53776

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 72% 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, secondary
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Perry before 0.5.1166 contains a JWT validation vulnerability that allows remote attackers to bypass token expiration by exploiting the unconditional setting of validate_exp = false in the verify_decode helper within the stdlib JWT verification path. Attackers in possession of a previously issued bearer token can present expired tokens to any jwt.verify() call and retain authenticated access indefinitely, bypassing force-expired sessions such as user logout or administrative revocation.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
27.9%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 16, 2026

Advisory Details (3)

Auto-updated Jun 16, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
generic

Perry < 0.5.1166 JWT Expiration Bypass via verify_decode | Advisories | VulnCheck

https://www.vulncheck.com/advisories/perry-jwt-expiration-bypass-via-verify-decode
github Patch Available🟡 PoC Available

stdlib Fails to Enforce JWT Token Expiration in verify_decode · Advisory · PerryTS/perry · GitHub

https://github.com/PerryTS/perry/security/advisories/GHSA-5324-c68v-8w62
github_release Patch Available

v0.5.1166

Patch available: PerryTS/perry v0.5.1166

https://github.com/PerryTS/perry/releases/v0.5.1166

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 45× in last 7d / 173× 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.

Showing the most recent 100 of 173 total refreshes for this CVE.

  1. 2026-07-12 07:44 UTCEG score recompute
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Frequently asked(5)

What is CVE-2026-53776?
CVE-2026-53776 is a critical vulnerability published on June 16, 2026. Perry before 0.5.1166 contains a JWT validation vulnerability that allows remote attackers to bypass token expiration by exploiting the unconditional setting of validateexp = false in the verifydecode helper within the stdlib JWT verification path. Attackers in possession of a previously issued…
When was CVE-2026-53776 disclosed?
CVE-2026-53776 was first published in the National Vulnerability Database on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53776 actively exploited?
CVE-2026-53776 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53776?
CVE-2026-53776 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-53776?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53776, 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.

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