CVE-2026-38640

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
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

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

A reachable unwrap in the __assert_fail function (/assert/mod.rs) of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via a crafted string.

CVSS v3
7.5
EG Score
7.5(high)
EPSS
35.8%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (4)

Auto-updated Jun 26, 2026
No patch confirmed yet.
generic

Reachable unwrap panic in `__assert_fail` (#262) · Issues · redox-os / relibc · GitLab

https://gitlab.redox-os.org/redox-os/relibc/-/work_items/262
generic

fix: `to_string_lossy` for safer string conversion in `__assert_fail` (!986) · Merge requests · redox-os / relibc · GitLab

https://gitlab.redox-os.org/redox-os/relibc/-/merge_requests/986
generic

Reachable unwrap panic in `__assert_fail` (#262) · Issues · redox-os / relibc · GitLab

https://gitlab.redox-os.org/redox-os/relibc/-/issues/262
generic

pocs/redox/CVE-2026-38640 at master · Marsman1996/pocs · GitHub

https://github.com/Marsman1996/pocs/tree/master/redox/CVE-2026-38640

Vendor Advisories for CVE-2026-38640(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 47× 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.

  1. 2026-07-07 01:52 UTCEG score recompute
  2. 2026-07-07 01:52 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 13:14 UTCEG score recompute
  6. 2026-07-06 13:13 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 00:36 UTCEG score recompute
  10. 2026-07-06 00:36 UTCGHSA enrichment
  11. 2026-07-05 12:00 UTCEG score recompute
  12. 2026-07-05 11:59 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 23:23 UTCEG score recompute
  15. 2026-07-04 23:23 UTCGHSA enrichment
  16. 2026-07-04 10:45 UTCEG score recompute
  17. 2026-07-04 10:45 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-03 22:07 UTCEG score recompute
  20. 2026-07-03 22:07 UTCGHSA enrichment
  21. 2026-07-03 09:29 UTCEG score recompute
  22. 2026-07-03 09:29 UTCGHSA enrichment
  23. 2026-07-02 20:53 UTCEG score recompute
  24. 2026-07-02 20:53 UTCGHSA enrichment
  25. 2026-07-02 08:17 UTCEG score recompute
Show 22 more
  1. 2026-07-02 08:17 UTCGHSA enrichment
  2. 2026-07-01 19:41 UTCEG score recompute
  3. 2026-07-01 19:41 UTCGHSA enrichment
  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-07-01 07:05 UTCEG score recompute
  6. 2026-07-01 07:05 UTCGHSA enrichment
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-30 18:30 UTCEG score recompute
  9. 2026-06-30 18:30 UTCGHSA enrichment
  10. 2026-06-30 05:54 UTCEG score recompute
  11. 2026-06-30 05:54 UTCGHSA enrichment
  12. 2026-06-29 17:19 UTCEG score recompute
  13. 2026-06-29 17:19 UTCGHSA enrichment
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 04:43 UTCEG score recompute▲ 7.50
  16. 2026-06-29 04:43 UTCGHSA enrichment
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 04:56 UTCEPSS rescore
  19. 2026-06-27 03:08 UTCEPSS rescore
  20. 2026-06-26 15:40 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  21. 2026-06-25 21:46 UTCEG score recompute
  22. 2026-06-25 21:46 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-38640?
CVE-2026-38640 is a high vulnerability published on June 25, 2026. A reachable unwrap in the assert_fail function (/assert/mod.rs) of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via a crafted string.
When was CVE-2026-38640 disclosed?
CVE-2026-38640 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-38640 actively exploited?
CVE-2026-38640 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-38640?
CVE-2026-38640 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-38640?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-38640, 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

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