CVE-2026-74889

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-17. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

openssl_encrypt versions before 1.4.0 use HKDF with no salt and static info parameter in key normalization functions, reducing entropy extraction and determinism. Attackers can exploit predictable key derivation with identical inputs to weaken cryptographic security against multi-target attacks.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
Patch available. Sources: github.
generic

openssl_encrypt before 1.4.0 Weak Key Derivation via HKDF | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openssl-encrypt-before-weak-key-derivation-via-hkdf
github Patch Available

HKDF key normalization uses no salt with static info parameter · Advisory · jahlives/openssl_encrypt · GitHub

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-j9mh-57cc-665x

Vendor Advisories for CVE-2026-74889(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 35× in last 7d / 35× 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. 2026-08-21 05:20 UTCGHSA enrichment
  2. 2026-08-21 01:30 UTCEG score recompute
  3. 2026-08-21 01:30 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 21:41 UTCGHSA enrichment
  6. 2026-08-20 17:51 UTCGHSA enrichment
  7. 2026-08-20 14:01 UTCGHSA enrichment
  8. 2026-08-20 09:48 UTCGHSA enrichment
  9. 2026-08-20 05:59 UTCGHSA enrichment
  10. 2026-08-20 02:09 UTCGHSA enrichment
  11. 2026-08-19 22:18 UTCGHSA enrichment
  12. 2026-08-19 18:28 UTCEG score recompute
  13. 2026-08-19 18:28 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 14:38 UTCGHSA enrichment
  16. 2026-08-19 10:48 UTCGHSA enrichment
  17. 2026-08-19 06:59 UTCGHSA enrichment
  18. 2026-08-19 03:08 UTCGHSA enrichment
  19. 2026-08-18 23:18 UTCGHSA enrichment
  20. 2026-08-18 19:25 UTCGHSA enrichment
  21. 2026-08-18 15:35 UTCEG score recompute
  22. 2026-08-18 15:35 UTCGHSA enrichment
  23. 2026-08-18 13:49 UTCEPSS rescore
  24. 2026-08-18 13:49 UTCEPSS rescore
  25. 2026-08-18 11:32 UTCGHSA enrichment
Show 10 more
  1. 2026-08-18 07:43 UTCGHSA enrichment
  2. 2026-08-18 03:52 UTCGHSA enrichment
  3. 2026-08-18 00:02 UTCGHSA enrichment
  4. 2026-08-17 20:12 UTCGHSA enrichment
  5. 2026-08-17 16:23 UTCGHSA enrichment
  6. 2026-08-17 15:28 UTCEG score recompute
  7. 2026-08-17 15:28 UTCGHSA enrichment
  8. 2026-08-17 11:39 UTCEG score recompute
  9. 2026-08-17 11:13 UTCEG score recompute
  10. 2026-08-17 11:12 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74889?
CVE-2026-74889 is a critical vulnerability published on August 17, 2026. openssl_encrypt versions before 1.4.0 use HKDF with no salt and static info parameter in key normalization functions, reducing entropy extraction and determinism. Attackers can exploit predictable key derivation with identical inputs to weaken cryptographic security against multi-target attacks.
When was CVE-2026-74889 disclosed?
CVE-2026-74889 was first published in the National Vulnerability Database on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74889 actively exploited?
CVE-2026-74889 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 89.6% of all scored CVEs.
What is the CVSS score of CVE-2026-74889?
CVE-2026-74889 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74889?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74889, 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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