fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.3.4, the fast-jwt createVerifier cache can continue accepting a previously valid, signed JWT after its exp time when caching is enabled and the token has exp but no iat. In src/verifier.js, cacheSet derives the exp cache deadline only when iat is present, so the cache falls back to cacheTTL, and a later cache hit returns the saved payload before verifyToken rechecks expiration. An attacker who can replay the same cached bearer token can extend access until the cache entry expires, but cannot forge a token through this issue. This issue is fixed in version 6.3.4.
CVE-2026-107719
MEDIUMPre-NVD 4.24.2Trending — 4 sources updated this weekElevatedEG-KEV Tier 3: ElevatedEG-KEV is EchelonGraph's own tiering of exploitation signals from CISA KEV, CISA's SSVC data (Vulnrichment), ransomware data, public exploit-code references and EPSS.Tier 3 is not evidence of exploitation. It means public exploit code is referenced, or CISA's SSVC data says "public PoC", or EPSS ranks the CVE in the top 5%.Signals for this CVE: CISA's SSVC exploitation value: public PoC.EchelonGraph confidence 38%: a heuristic from the tier and the number of signals, not a measured probability.
EchelonGraph scoreHIGH confidence
“—” beside the score: it is equal to the CVSS score beside it.
Score 4.2 from GitHub Security Advisory (severity: MODERATE) published 2026-10-08. A secondary CVSS source baseline 4.2; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Also known asEUVD-2026-95343 (ENISA EUVD) · GHSA-x937-hj6v-793p (GitHub Security Advisories)Source: ENISA EUVD
4.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.2Exploit: No code on recordExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 4.2
- EG Score
- 4.2MEDIUMhigh confidence
- EG Risk
- 35EG Risk 35/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity42% × 45%Impact severity (EG Severity): CVSS 4.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 19th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (4.2): severity, escalated by confirmed exploitation. This CVE's 4.2 is its impact severity (EG Severity), not escalated.
- EG Severity
- 4.2 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
October 8, 2026
Last Modified
October 9, 2026
Advisory Details (3)
Auto-updated Oct 8, 2026Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)
Verifier cache accepts expired JWTs without iat. · Advisory · nearform/fast-jwt · GitHub
https://github.com/nearform/fast-jwt/security/advisories/GHSA-x937-hj6v-793pGitHub release Patch Available
v6.3.4
Patch available: nearform/fast-jwt v6.3.4
https://github.com/nearform/fast-jwt/releases/tag/v6.3.4GitHub commit Patch Available
commit fc1ddbbe5ce3 (nearform/fast-jwt)
Patch available: nearform/fast-jwt v6.3.4 (contains commit fc1ddbbe5ce3)
https://github.com/nearform/fast-jwt/commit/fc1ddbbe5ce38066ba2cea0b0ce0233932757167Vendor Advisories for CVE-2026-107719(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 | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| npm | fast-jwt @ 6.3.4 (fixes <= 6.3.3) | — | ghsa |
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)
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fast-jwt | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 40× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-11-01 08:00 UTCGHSA enrichmentGHSA-x937-hj6v-793p · GitHub severity MODERATE · GitHub CVSS 4.2
- 2026-11-01 08:00 UTCEG score recompute
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-31 11:25 UTCOSV refresh
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
- 2026-10-25 14:54 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-23 08:37 UTCEG score recompute
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-18 05:07 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
Show 15 moreShow fewer
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-12 16:38 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-11 20:14 UTCEG score recompute
- 2026-10-11 17:16 UTCEG score recompute
- 2026-10-11 15:00 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-10 16:56 UTCEG score recompute
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-09 16:34 UTCEG score recompute
- 2026-10-09 15:59 UTCEG score recompute
- 2026-10-08 22:21 UTCEG score recompute
- 2026-10-08 21:53 UTCEG score recomputeFirst assessed: 4.2 MEDIUM
- 2026-10-08 21:53 UTCMITRE cvelistV5first tracked
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10 shownnpm:fast-jwt
Frequently asked(5)
What is CVE-2026-107719?
CVE-2026-107719 is a medium-severity vulnerability; its CVE record was published on October 8, 2026. fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.3.4, the fast-jwt createVerifier cache can continue accepting a previously valid, signed JWT after its exp time when caching is enabled and the token has exp but no iat. In src/verifier.js, cacheSet derives the exp cache…
When was the CVE record for CVE-2026-107719 published?
The CVE record for CVE-2026-107719 was published on October 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-107719 actively exploited?
CVE-2026-107719 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107719?
CVE-2026-107719 has a CVSS base score of 4.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107719?
A fix for CVE-2026-107719 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107719 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-107719
Is Your Infrastructure Affected by CVE-2026-107719?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.