CVE-2026-41676

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 79% 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, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a heap/stack overflow from safe code. OpenSSL 3.x providers do check, so this only impacts older OpenSSL. This vulnerability is fixed in 0.10.78.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
21.6%
KEV
Not listed

Published

April 24, 2026

Last Modified

April 28, 2026

Advisory Details (1)

Auto-updated May 10, 2026
Patch available. Sources: github.
github Patch Available

Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1 · Advisory · rust-openssl/rust-openssl · GitHub

https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5

Vendor Advisories for CVE-2026-41676(1)

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

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
openssl—0.10.78—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 41× 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 145 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-07 13:46 UTCEPSS rescore
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  1. 2026-06-18 17:52 UTCEPSS rescore
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  6. 2026-06-15 05:52 UTCEG score recompute
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  11. 2026-06-13 23:00 UTCEPSS rescore
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  26. 2026-06-10 12:09 UTCEG score recompute
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  43. 2026-06-07 15:25 UTCEPSS rescore
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  71. 2026-06-04 09:16 UTCEG score recompute
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  73. 2026-06-03 23:30 UTCEG score recompute
  74. 2026-06-03 19:29 UTCEG score recompute
  75. 2026-06-03 15:28 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-41676?
CVE-2026-41676 is a critical vulnerability published on April 24, 2026. rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVPPKEYderive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and…
When was CVE-2026-41676 disclosed?
CVE-2026-41676 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on April 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41676 actively exploited?
CVE-2026-41676 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41676?
CVE-2026-41676 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-41676?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41676, 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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