CVE-2026-74890

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-17. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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%CVSS: 5.5Exploit: 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 1.4.0 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
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 17, 2026

Last Modified

September 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 rangeFixed inDependents
openssl-encrypt0.2.2 ... 1.4.0b8 (44 versions)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 / 79× 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. 2026-09-18 21:56 UTCEG score recompute
  2. 2026-09-18 21:56 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 21:57 UTCEG score recompute
  5. 2026-09-17 21:57 UTCGHSA enrichment
  6. 2026-09-16 23:11 UTCEG score recompute
  7. 2026-09-16 23:11 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 19:16 UTCEG score recompute
  11. 2026-09-15 19:16 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-14 19:56 UTCGHSA enrichment
  14. 2026-09-13 21:13 UTCEG score recompute
  15. 2026-09-13 21:13 UTCGHSA enrichment
  16. 2026-09-12 22:32 UTCEG score recompute
  17. 2026-09-12 22:32 UTCGHSA enrichment
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-11 23:51 UTCEG score recompute
  20. 2026-09-11 23:51 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 01:10 UTCEG score recompute
  23. 2026-09-11 01:10 UTCGHSA enrichment
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-10 02:26 UTCGHSA enrichment
Show 65 more
  1. 2026-09-09 03:43 UTCEG score recompute
  2. 2026-09-09 03:43 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 11:26 UTCEG score recompute
  5. 2026-09-07 11:26 UTCGHSA enrichment
  6. 2026-09-06 13:48 UTCEPSS rescore
  7. 2026-09-06 12:18 UTCEG score recompute
  8. 2026-09-06 12:18 UTCGHSA enrichment
  9. 2026-09-05 13:32 UTCGHSA enrichment
  10. 2026-09-04 14:50 UTCEG score recompute
  11. 2026-09-04 14:50 UTCGHSA enrichment
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-03 16:06 UTCGHSA enrichment
  14. 2026-09-02 17:12 UTCEG score recompute
  15. 2026-09-02 17:12 UTCGHSA enrichment
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 16:03 UTCEG score recompute
  18. 2026-09-01 16:03 UTCGHSA enrichment
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-09-01 04:40 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-08-31 20:33 UTCGHSA enrichment
  23. 2026-08-31 03:07 UTCEG score recompute
  24. 2026-08-31 03:07 UTCGHSA enrichment
  25. 2026-08-30 19:18 UTCEPSS rescore
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 04:24 UTCEG score recompute
  28. 2026-08-30 04:24 UTCGHSA enrichment
  29. 2026-08-30 01:22 UTCEPSS rescore
  30. 2026-08-29 05:40 UTCEG score recompute
  31. 2026-08-29 05:40 UTCGHSA enrichment
  32. 2026-08-28 21:42 UTCEPSS rescore
  33. 2026-08-28 01:55 UTCEG score recompute
  34. 2026-08-28 01:55 UTCGHSA enrichment
  35. 2026-08-27 14:25 UTCEPSS rescore
  36. 2026-08-27 03:14 UTCEG score recompute
  37. 2026-08-27 03:14 UTCGHSA enrichment
  38. 2026-08-26 14:47 UTCEPSS rescore
  39. 2026-08-26 04:33 UTCEG score recompute
  40. 2026-08-26 04:33 UTCGHSA enrichment
  41. 2026-08-25 13:49 UTCEPSS rescore
  42. 2026-08-25 05:52 UTCEG score recompute
  43. 2026-08-25 05:52 UTCGHSA enrichment
  44. 2026-08-24 14:18 UTCEPSS rescore
  45. 2026-08-24 07:10 UTCGHSA enrichment
  46. 2026-08-23 08:28 UTCGHSA enrichment
  47. 2026-08-22 09:47 UTCEG score recompute
  48. 2026-08-22 09:47 UTCGHSA enrichment
  49. 2026-08-21 23:49 UTCEPSS rescore
  50. 2026-08-21 11:06 UTCEG score recompute
  51. 2026-08-21 11:05 UTCGHSA enrichment
  52. 2026-08-20 22:56 UTCEPSS rescore
  53. 2026-08-20 12:21 UTCEG score recompute
  54. 2026-08-20 12:21 UTCGHSA enrichment
  55. 2026-08-19 17:04 UTCEPSS rescore
  56. 2026-08-19 13:40 UTCGHSA enrichment
  57. 2026-08-18 14:56 UTCEG score recompute
  58. 2026-08-18 14:56 UTCGHSA enrichment
  59. 2026-08-18 13:49 UTCEPSS rescore
  60. 2026-08-18 13:49 UTCEPSS rescore
  61. 2026-08-17 15:20 UTCEG score recompute
  62. 2026-08-17 15:20 UTCGHSA enrichment
  63. 2026-08-17 11:39 UTCEG score recompute
  64. 2026-08-17 11:13 UTCEG score recompute
  65. 2026-08-17 11:12 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 17, 2026, with the most recent update on September 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% probability of exploitation in the next 30 days, which ranks it in the top 95.0% of all scored CVEs.
What is the CVSS score of CVE-2026-74890?
CVE-2026-74890 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-74890?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74890, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-74890

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