CVE-2026-2240

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: Elevated riskExposed: 0

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

A vulnerability has been found in janet-lang janet up to 1.40.1. The impacted element is the function janetc_pop_funcdef of the file src/core/compile.c. Such manipulation leads to out-of-bounds read. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The name of the patch is 4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5. A patch should be applied to remediate this issue.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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 computed
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

February 9, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

0123/ja4/repro at main · oneafter/0123 · GitHub

https://github.com/oneafter/0123/blob/main/ja4/repro
generic

[Bug] Heap-buffer-overflow in janetc_pop_funcdef accessing memory allocated by calloc · Issue #1702 · janet-lang/janet · GitHub

https://github.com/janet-lang/janet/issues/1702#issuecomment-3790473369
generic

[Bug] Heap-buffer-overflow in janetc_pop_funcdef accessing memory allocated by calloc · Issue #1702 · janet-lang/janet · GitHub

https://github.com/janet-lang/janet/issues/1702
github_commit

commit 4dd08a4cdef5 (janet-lang/janet)

Fix landed in janet-lang/janet commit 4dd08a4cdef5 — awaiting tagged release

https://github.com/janet-lang/janet/commit/4dd08a4cdef5b1c42d9a2c19fc24412e97ef51d5
generic

GitHub - janet-lang/janet: A dynamic language and bytecode vm · GitHub

https://github.com/janet-lang/janet/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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 183 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-20 20:15 UTCEPSS rescore
  3. 2026-09-18 22:42 UTCOSV refresh
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  1. 2026-08-26 14:46 UTCEPSS rescore
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  12. 2026-08-14 10:46 UTCEG score recompute
  13. 2026-08-14 10:46 UTCGHSA enrichment
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  16. 2026-08-13 03:04 UTCGHSA enrichment
  17. 2026-08-12 13:50 UTCEPSS rescore
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  20. 2026-08-09 15:28 UTCEG score recompute
  21. 2026-08-09 15:28 UTCGHSA enrichment
  22. 2026-08-09 13:46 UTCEPSS rescore
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  24. 2026-08-07 22:26 UTCEG score recompute
  25. 2026-08-07 22:26 UTCGHSA enrichment
  26. 2026-08-06 13:46 UTCEPSS rescore
  27. 2026-08-06 04:09 UTCEG score recompute
  28. 2026-08-06 04:09 UTCGHSA enrichment
  29. 2026-08-05 19:17 UTCEPSS rescore
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  32. 2026-08-02 21:05 UTCEG score recompute▲ 2.80
  33. 2026-08-02 21:05 UTCGHSA enrichment
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  44. 2026-07-23 03:06 UTCEG score recompute
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  55. 2026-07-17 17:29 UTCOSV refresh
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  74. 2026-07-05 02:30 UTCEPSS rescore
  75. 2026-07-04 06:31 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-2240?
CVE-2026-2240 is a medium vulnerability published on February 9, 2026. A vulnerability has been found in janet-lang janet up to 1.40.1. The impacted element is the function janetcpopfuncdef of the file src/core/compile.c. Such manipulation leads to out-of-bounds read. The attack must be carried out locally. The exploit has been disclosed to the public and may be used.…
When was CVE-2026-2240 disclosed?
CVE-2026-2240 was first published in the National Vulnerability Database on February 9, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2240 actively exploited?
CVE-2026-2240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.0% of all scored CVEs.
What is the CVSS score of CVE-2026-2240?
CVE-2026-2240 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-2240?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2240, 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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