CVE-2026-81699

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-27. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: 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 1.4.9 fail to properly validate key derivation function costs in crafted files, allowing attackers to trigger unbounded memory and CPU exhaustion during pre-authentication processing. Attackers can supply malicious files with excessive KDF parameters to exhaust system resources and crash or wedge the process before password verification occurs.

CVSS v3
7.5
EG Score
7.5(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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

August 27, 2026

Last Modified

September 3, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
Patch available. Sources: github.
generic

openssl_encrypt before 1.4.9 Denial of Service via unbounded KDF cost | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-denial-of-service-via-unbounded-kdf-cost
github Patch Available

Pre-authentication memory/CPU exhaustion via unbounded KDF cost in crafted files · Advisory · jahlives/openssl_encrypt · GitHub

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-phmr-p567-q5g6

Vendor Advisories for CVE-2026-81699(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)
PyPI(1)
PackageVulnerable rangeFixed inDependents
openssl-encrypt0.2.2 ... 1.4.8 (53 versions)1.4.9—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 91× 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 01:06 UTCEG score recompute
  2. 2026-09-19 01:05 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 13:05 UTCGHSA enrichment
  5. 2026-09-18 01:05 UTCEG score recompute
  6. 2026-09-18 01:05 UTCGHSA enrichment
  7. 2026-09-17 13:05 UTCGHSA enrichment
  8. 2026-09-17 00:55 UTCEG score recompute
  9. 2026-09-17 00:55 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 12:55 UTCEG score recompute
  12. 2026-09-16 12:55 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-16 00:55 UTCGHSA enrichment
  15. 2026-09-15 12:55 UTCEG score recompute
  16. 2026-09-15 12:55 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 00:55 UTCGHSA enrichment
  20. 2026-09-14 12:55 UTCGHSA enrichment
  21. 2026-09-14 00:55 UTCEG score recompute
  22. 2026-09-14 00:55 UTCGHSA enrichment
  23. 2026-09-13 12:55 UTCGHSA enrichment
  24. 2026-09-13 00:55 UTCEG score recompute
  25. 2026-09-13 00:55 UTCGHSA enrichment
Show 66 more
  1. 2026-09-12 12:55 UTCGHSA enrichment
  2. 2026-09-12 00:55 UTCEG score recompute
  3. 2026-09-12 00:55 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 12:55 UTCEG score recompute
  7. 2026-09-11 12:55 UTCGHSA enrichment
  8. 2026-09-11 00:45 UTCGHSA enrichment
  9. 2026-09-10 12:45 UTCEG score recompute
  10. 2026-09-10 12:45 UTCGHSA enrichment
  11. 2026-09-10 00:45 UTCGHSA enrichment
  12. 2026-09-09 12:45 UTCGHSA enrichment
  13. 2026-09-09 00:41 UTCEG score recompute
  14. 2026-09-09 00:41 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 03:19 UTCEG score recompute
  17. 2026-09-08 03:19 UTCGHSA enrichment
  18. 2026-09-07 15:18 UTCGHSA enrichment
  19. 2026-09-07 03:19 UTCGHSA enrichment
  20. 2026-09-06 15:14 UTCEG score recompute
  21. 2026-09-06 15:14 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 03:14 UTCEG score recompute
  24. 2026-09-06 03:14 UTCGHSA enrichment
  25. 2026-09-05 15:31 UTCEPSS rescore
  26. 2026-09-05 15:14 UTCGHSA enrichment
  27. 2026-09-05 03:12 UTCGHSA enrichment
  28. 2026-09-04 15:12 UTCEG score recompute
  29. 2026-09-04 15:12 UTCGHSA enrichment
  30. 2026-09-04 05:07 UTCEPSS rescore
  31. 2026-09-04 03:11 UTCGHSA enrichment
  32. 2026-09-03 15:10 UTCGHSA enrichment
  33. 2026-09-03 09:03 UTCGHSA enrichment
  34. 2026-09-02 21:03 UTCEG score recompute
  35. 2026-09-02 21:03 UTCGHSA enrichment
  36. 2026-09-02 14:12 UTCEPSS rescore
  37. 2026-09-02 09:02 UTCGHSA enrichment
  38. 2026-09-01 20:56 UTCEG score recompute
  39. 2026-09-01 20:56 UTCGHSA enrichment
  40. 2026-09-01 13:54 UTCEPSS rescore
  41. 2026-09-01 08:56 UTCEG score recompute
  42. 2026-09-01 08:56 UTCGHSA enrichment
  43. 2026-09-01 04:40 UTCEPSS rescore
  44. 2026-09-01 04:40 UTCEPSS rescore
  45. 2026-08-31 20:54 UTCGHSA enrichment
  46. 2026-08-31 20:48 UTCGHSA enrichment
  47. 2026-08-31 08:48 UTCGHSA enrichment
  48. 2026-08-30 20:44 UTCEG score recompute
  49. 2026-08-30 20:44 UTCGHSA enrichment
  50. 2026-08-30 19:18 UTCEPSS rescore
  51. 2026-08-30 19:17 UTCEPSS rescore
  52. 2026-08-30 08:44 UTCEG score recompute
  53. 2026-08-30 08:44 UTCGHSA enrichment
  54. 2026-08-30 01:22 UTCEPSS rescore
  55. 2026-08-29 20:45 UTCGHSA enrichment
  56. 2026-08-29 08:44 UTCEG score recompute
  57. 2026-08-29 08:43 UTCGHSA enrichment
  58. 2026-08-28 21:42 UTCEPSS rescore
  59. 2026-08-28 20:43 UTCEG score recompute
  60. 2026-08-28 20:43 UTCGHSA enrichment
  61. 2026-08-28 17:38 UTCGHSA enrichment
  62. 2026-08-28 05:32 UTCEG score recompute
  63. 2026-08-28 05:32 UTCGHSA enrichment
  64. 2026-08-27 17:25 UTCEG score recompute
  65. 2026-08-27 16:47 UTCEG score recompute
  66. 2026-08-27 16:43 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81699?
CVE-2026-81699 is a high vulnerability published on August 27, 2026. openssl_encrypt versions before 1.4.9 fail to properly validate key derivation function costs in crafted files, allowing attackers to trigger unbounded memory and CPU exhaustion during pre-authentication processing. Attackers can supply malicious files with excessive KDF parameters to exhaust…
When was CVE-2026-81699 disclosed?
CVE-2026-81699 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81699 actively exploited?
CVE-2026-81699 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 70.9% of all scored CVEs.
What is the CVSS score of CVE-2026-81699?
CVE-2026-81699 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-81699?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81699, 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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