CVE-2026-81688

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 store an unkeyed SHA-256 hash of the plaintext in the cleartext file header metadata. Attackers can read this hash without the password to confirm guessed plaintexts offline or fingerprint identical plaintexts across separately-encrypted files.

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
10%
KEV
Not listed

Published

August 27, 2026

Last Modified

September 2, 2026

Advisory Details (2)

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

openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256 | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-plaintext-confirmation-oracle-via-sha-256
github Patch Available

Unkeyed SHA-256 of the plaintext stored in the cleartext file header is a plaintext-confirmation oracle · Advisory · jahlives/openssl_encrypt · GitHub

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-7c3q-gp4v-q29q

Vendor Advisories for CVE-2026-81688(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 00:22 UTCEG score recompute
  2. 2026-09-19 00:22 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 13:06 UTCGHSA enrichment
  5. 2026-09-18 01:49 UTCEG score recompute
  6. 2026-09-18 01:49 UTCGHSA enrichment
  7. 2026-09-17 14:33 UTCGHSA enrichment
  8. 2026-09-17 03:11 UTCGHSA enrichment
  9. 2026-09-16 15:54 UTCEG score recompute
  10. 2026-09-16 15:54 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 04:38 UTCGHSA enrichment
  14. 2026-09-15 17:22 UTCGHSA enrichment
  15. 2026-09-15 06:06 UTCEG score recompute
  16. 2026-09-15 06:06 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 18:48 UTCGHSA enrichment
  20. 2026-09-14 06:32 UTCGHSA enrichment
  21. 2026-09-13 19:16 UTCEG score recompute
  22. 2026-09-13 19:16 UTCGHSA enrichment
  23. 2026-09-13 07:59 UTCGHSA enrichment
  24. 2026-09-12 20:43 UTCEG score recompute
  25. 2026-09-12 20:43 UTCGHSA enrichment
Show 66 more
  1. 2026-09-12 09:26 UTCGHSA enrichment
  2. 2026-09-11 22:10 UTCEG score recompute
  3. 2026-09-11 22:10 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 10:53 UTCEG score recompute
  7. 2026-09-11 10:53 UTCGHSA enrichment
  8. 2026-09-10 23:09 UTCGHSA enrichment
  9. 2026-09-10 11:52 UTCEG score recompute
  10. 2026-09-10 11:52 UTCGHSA enrichment
  11. 2026-09-09 23:59 UTCGHSA enrichment
  12. 2026-09-09 11:57 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 04:47 UTCGHSA enrichment
  17. 2026-09-07 17:30 UTCEG score recompute
  18. 2026-09-07 17:30 UTCGHSA enrichment
  19. 2026-09-07 06:14 UTCGHSA enrichment
  20. 2026-09-06 18:54 UTCEG score recompute
  21. 2026-09-06 18:54 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 07:37 UTCGHSA enrichment
  24. 2026-09-05 20:20 UTCEG score recompute
  25. 2026-09-05 20:20 UTCGHSA enrichment
  26. 2026-09-05 15:31 UTCEPSS rescore
  27. 2026-09-05 09:03 UTCGHSA enrichment
  28. 2026-09-04 21:46 UTCEG score recompute
  29. 2026-09-04 21:45 UTCGHSA enrichment
  30. 2026-09-04 10:22 UTCEG score recompute
  31. 2026-09-04 10:22 UTCGHSA enrichment
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-03 23:06 UTCGHSA enrichment
  34. 2026-09-03 11:50 UTCGHSA enrichment
  35. 2026-09-03 00:29 UTCEG score recompute
  36. 2026-09-03 00:29 UTCGHSA enrichment
  37. 2026-09-02 14:12 UTCEPSS rescore
  38. 2026-09-02 13:13 UTCGHSA enrichment
  39. 2026-09-02 11:57 UTCGHSA enrichment
  40. 2026-09-02 00:39 UTCEG score recompute
  41. 2026-09-02 00:39 UTCGHSA enrichment
  42. 2026-09-01 13:54 UTCEPSS rescore
  43. 2026-09-01 13:21 UTCGHSA enrichment
  44. 2026-09-01 02:04 UTCGHSA enrichment
  45. 2026-08-31 14:45 UTCGHSA enrichment
  46. 2026-08-31 03:27 UTCEG score recompute
  47. 2026-08-31 03:27 UTCGHSA enrichment
  48. 2026-08-30 19:18 UTCEPSS rescore
  49. 2026-08-30 19:17 UTCEPSS rescore
  50. 2026-08-30 16:11 UTCGHSA enrichment
  51. 2026-08-30 04:55 UTCEG score recompute
  52. 2026-08-30 04:54 UTCGHSA enrichment
  53. 2026-08-30 01:22 UTCEPSS rescore
  54. 2026-08-29 17:37 UTCGHSA enrichment
  55. 2026-08-29 06:20 UTCEG score recompute
  56. 2026-08-29 06:20 UTCGHSA enrichment
  57. 2026-08-28 21:42 UTCEPSS rescore
  58. 2026-08-28 19:03 UTCGHSA enrichment
  59. 2026-08-28 07:45 UTCGHSA enrichment
  60. 2026-08-27 20:27 UTCEG score recompute
  61. 2026-08-27 20:27 UTCGHSA enrichment
  62. 2026-08-27 20:18 UTCEG score recompute
  63. 2026-08-27 20:18 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-2026-81688?
CVE-2026-81688 is a high vulnerability published on August 27, 2026. openssl_encrypt versions before 1.4.9 store an unkeyed SHA-256 hash of the plaintext in the cleartext file header metadata. Attackers can read this hash without the password to confirm guessed plaintexts offline or fingerprint identical plaintexts across separately-encrypted files.
When was CVE-2026-81688 disclosed?
CVE-2026-81688 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81688 actively exploited?
CVE-2026-81688 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 90.1% of all scored CVEs.
What is the CVSS score of CVE-2026-81688?
CVE-2026-81688 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-81688?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81688, 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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