CVE-2026-57842

HIGHPre-NVD 7.07.0—
EchelonGraph scoreHIGH confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-11. a secondary CVSS source baseline 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: None knownExposed: 0

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

NetBSD contains a use-after-free and double-free vulnerability in msg_recv_copyin() within the COMPAT_NETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a kernel panic or memory corruption by calling recvmsg() with msg_iovlen between 9 and IOV_MAX, causing the kernel to access a freed iovec buffer and subsequently free the same allocation a second time.

CVSS v3
7.0
EG Score
7.0(high)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity70% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 11, 2026

Advisory Details (2)

Auto-updated Sep 11, 2026
No patch confirmed yet.
generic

NetBSD COMPAT_NETBSD32 Double Free / Use-After-Free via recvmsg() msg_iovlen | Advisories | VulnCheck

https://www.vulncheck.com/advisories/netbsd-compat-netbsd32-double-free-use-after-free-via-recvmsg-msg-iovlen
generic

NetBSD Problem Report #60373: compat32: kernel use-after-free in recvmsg

https://gnats.netbsd.org/60373

Vendor Advisories for CVE-2026-57842(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 36× 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. 2026-09-19 20:35 UTCGHSA enrichment
  2. 2026-09-19 08:59 UTCGHSA enrichment
  3. 2026-09-18 21:24 UTCEG score recompute
  4. 2026-09-18 21:24 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 09:49 UTCGHSA enrichment
  7. 2026-09-17 22:14 UTCEG score recompute
  8. 2026-09-17 22:14 UTCGHSA enrichment
  9. 2026-09-17 19:31 UTCEPSS rescore
  10. 2026-09-17 10:38 UTCGHSA enrichment
  11. 2026-09-16 23:03 UTCEG score recompute
  12. 2026-09-16 23:03 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 11:26 UTCEG score recompute
  15. 2026-09-16 11:26 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-15 23:48 UTCGHSA enrichment
  18. 2026-09-15 12:12 UTCEG score recompute
  19. 2026-09-15 12:12 UTCGHSA enrichment
  20. 2026-09-15 03:11 UTCEPSS rescore
  21. 2026-09-15 00:36 UTCGHSA enrichment
  22. 2026-09-14 13:00 UTCGHSA enrichment
  23. 2026-09-14 01:25 UTCEG score recompute
  24. 2026-09-14 01:25 UTCGHSA enrichment
  25. 2026-09-13 16:47 UTCEPSS rescore
Show 11 more
  1. 2026-09-13 13:50 UTCGHSA enrichment
  2. 2026-09-13 02:15 UTCEG score recompute
  3. 2026-09-13 02:15 UTCGHSA enrichment
  4. 2026-09-12 14:39 UTCGHSA enrichment
  5. 2026-09-12 03:04 UTCEG score recompute
  6. 2026-09-12 03:04 UTCGHSA enrichment
  7. 2026-09-11 15:28 UTCEG score recompute
  8. 2026-09-11 15:04 UTCEG score recompute
  9. 2026-09-11 14:23 UTCEG score recompute
  10. 2026-09-11 13:55 UTCEG score recompute
  11. 2026-09-11 13:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-57842?
CVE-2026-57842 is a high vulnerability published on September 11, 2026. NetBSD contains a use-after-free and double-free vulnerability in msgrecvcopyin() within the COMPATNETBSD32 compatibility layer due to a missing return statement before the cleanup label on the success path. Any local user able to execute a 32-bit binary on a 64-bit NetBSD system can trigger a…
When was CVE-2026-57842 disclosed?
CVE-2026-57842 was first published in the National Vulnerability Database on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57842 actively exploited?
CVE-2026-57842 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 99.2% of all scored CVEs.
What is the CVSS score of CVE-2026-57842?
CVE-2026-57842 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2026-57842?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57842, 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

Explore the affected products and dependency analysis for CVE-2026-57842

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