CVE-2026-74890

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-17. The CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation and verification when the PYTEST_CURRENT_TEST environment variable is set. Attackers with code execution can set this environment variable to produce unauthenticated ciphertext and bypass integrity protection on encrypted data.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
10th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 17, 2026

Last Modified

October 1, 2026

Advisory Details (2)

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

openssl_encrypt before 1.4.0 HMAC Authentication Bypass via Environment Variable | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openssl-encrypt-before-hmac-authentication-bypass-via-environment-variable
github Patch Available

Camellia test mode disables HMAC authentication via environment variable · Advisory · jahlives/openssl_encrypt · GitHub

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-rvc2-5jxq-gpcj

Vendor Advisories for CVE-2026-74890(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 rangeFix by version rangeDependents
openssl-encrypt0.2.2 ... 1.4.0b8 (44 versions)
  • every version up to 1.4.0: fixed in 1.4.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 75× 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 131 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 16:32 UTCGHSA enrichment
  3. 2026-10-03 17:50 UTCEG score recompute
  4. 2026-10-03 17:50 UTCGHSA enrichment
  5. 2026-10-03 14:26 UTCEPSS rescore
  6. 2026-10-02 15:47 UTCEG score recompute
  7. 2026-10-02 15:47 UTCGHSA enrichment
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-10-01 15:29 UTCEG score recompute
  10. 2026-10-01 15:29 UTCGHSA enrichment
  11. 2026-10-01 08:44 UTCEG score recompute
  12. 2026-10-01 08:44 UTCGHSA enrichment
  13. 2026-09-30 10:03 UTCEG score recompute
  14. 2026-09-30 10:03 UTCGHSA enrichment
  15. 2026-09-29 15:24 UTCEPSS rescore
  16. 2026-09-29 05:45 UTCEG score recompute
  17. 2026-09-29 05:45 UTCGHSA enrichment
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-28 07:04 UTCEG score recompute
  20. 2026-09-28 07:04 UTCGHSA enrichment
  21. 2026-09-27 13:48 UTCEPSS rescore
  22. 2026-09-27 08:18 UTCEG score recompute
  23. 2026-09-27 08:18 UTCGHSA enrichment
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-26 00:28 UTCEPSS rescore
Show 75 more
  1. 2026-09-25 02:11 UTCEG score recompute
  2. 2026-09-25 02:11 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 20:28 UTCEG score recompute
  5. 2026-09-23 20:28 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-22 20:42 UTCEG score recompute
  8. 2026-09-22 20:41 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 18:41 UTCEG score recompute
  12. 2026-09-21 18:41 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 19:18 UTCGHSA enrichment
  15. 2026-09-19 20:37 UTCEG score recompute
  16. 2026-09-19 20:37 UTCGHSA enrichment
  17. 2026-09-18 21:56 UTCEG score recompute
  18. 2026-09-18 21:56 UTCGHSA enrichment
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-17 21:57 UTCEG score recompute
  21. 2026-09-17 21:57 UTCGHSA enrichment
  22. 2026-09-16 23:11 UTCEG score recompute
  23. 2026-09-16 23:11 UTCGHSA enrichment
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 05:15 UTCEPSS rescore
  26. 2026-09-15 19:16 UTCEG score recompute
  27. 2026-09-15 19:16 UTCGHSA enrichment
  28. 2026-09-15 03:12 UTCEPSS rescore
  29. 2026-09-14 19:56 UTCGHSA enrichment
  30. 2026-09-13 21:13 UTCEG score recompute
  31. 2026-09-13 21:13 UTCGHSA enrichment
  32. 2026-09-12 22:32 UTCEG score recompute
  33. 2026-09-12 22:32 UTCGHSA enrichment
  34. 2026-09-12 15:02 UTCEPSS rescore
  35. 2026-09-11 23:51 UTCEG score recompute
  36. 2026-09-11 23:51 UTCGHSA enrichment
  37. 2026-09-11 14:53 UTCEPSS rescore
  38. 2026-09-11 01:10 UTCEG score recompute
  39. 2026-09-11 01:10 UTCGHSA enrichment
  40. 2026-09-10 09:35 UTCEPSS rescore
  41. 2026-09-10 02:26 UTCGHSA enrichment
  42. 2026-09-09 03:43 UTCEG score recompute
  43. 2026-09-09 03:43 UTCGHSA enrichment
  44. 2026-09-08 22:01 UTCEPSS rescore
  45. 2026-09-07 11:26 UTCEG score recompute
  46. 2026-09-07 11:26 UTCGHSA enrichment
  47. 2026-09-06 13:48 UTCEPSS rescore
  48. 2026-09-06 12:18 UTCEG score recompute
  49. 2026-09-06 12:18 UTCGHSA enrichment
  50. 2026-09-05 13:32 UTCGHSA enrichment
  51. 2026-09-04 14:50 UTCEG score recompute
  52. 2026-09-04 14:50 UTCGHSA enrichment
  53. 2026-09-04 05:07 UTCEPSS rescore
  54. 2026-09-03 16:06 UTCGHSA enrichment
  55. 2026-09-02 17:12 UTCEG score recompute
  56. 2026-09-02 17:12 UTCGHSA enrichment
  57. 2026-09-02 14:12 UTCEPSS rescore
  58. 2026-09-01 16:03 UTCEG score recompute
  59. 2026-09-01 16:03 UTCGHSA enrichment
  60. 2026-09-01 13:54 UTCEPSS rescore
  61. 2026-09-01 04:40 UTCEPSS rescore
  62. 2026-09-01 04:40 UTCEPSS rescore
  63. 2026-08-31 20:33 UTCGHSA enrichment
  64. 2026-08-31 03:07 UTCEG score recompute
  65. 2026-08-31 03:07 UTCGHSA enrichment
  66. 2026-08-30 19:18 UTCEPSS rescore
  67. 2026-08-30 19:17 UTCEPSS rescore
  68. 2026-08-30 04:24 UTCEG score recompute
  69. 2026-08-30 04:24 UTCGHSA enrichment
  70. 2026-08-30 01:22 UTCEPSS rescore
  71. 2026-08-29 05:40 UTCEG score recompute
  72. 2026-08-29 05:40 UTCGHSA enrichment
  73. 2026-08-28 21:42 UTCEPSS rescore
  74. 2026-08-28 01:55 UTCEG score recompute
  75. 2026-08-28 01:55 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-74890?
CVE-2026-74890 is a medium vulnerability published on August 17, 2026. opensslencrypt versions before 1.4.0 contain an authentication bypass vulnerability in CamelliaCipher that disables HMAC tag generation and verification when the PYTESTCURRENT_TEST environment variable is set. Attackers with code execution can set this environment variable to produce…
When was CVE-2026-74890 disclosed?
CVE-2026-74890 was first published on August 17, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74890 actively exploited?
CVE-2026-74890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74890?
CVE-2026-74890 has a CVSS base score of 5.5 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-74890?
A fix for CVE-2026-74890 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74890 are linked in the Vendor Advisories panel on this page.

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