CVE-2026-74871

MEDIUMNVD 5.56.2▲
EchelonGraph scoreMEDIUM confidence

Score 6.2 from GitHub Security Advisory published 2026-08-17. NVD baseline CVSS 5.5; sources differ by 0.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.2EG
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 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last stage cancels out during key generation. When configured with a single KDF and no prior hashing stage, attackers can bypass memory-hard key derivation and perform offline password cracking at SHA-256 speed instead of the configured KDF cost.

CVSS v3
5.5
EG Score
6.2(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity62% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

August 17, 2026

Last Modified

September 10, 2026

Advisory Details (2)

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

openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor
github Patch Available

Sequential-XOR last-stage cancellation bypasses KDF cost (memory-hard hashing defeated for --xor files) · Advisory · jahlives/openssl_encrypt · GitHub

https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43

Vendor Advisories for CVE-2026-74871(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 ... 1.4.5 (50 versions)1.4.6—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 69× 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 02:20 UTCGHSA enrichment
  2. 2026-09-18 03:54 UTCEG score recompute
  3. 2026-09-18 03:54 UTCGHSA enrichment
  4. 2026-09-17 05:32 UTCEG score recompute
  5. 2026-09-17 05:32 UTCGHSA enrichment
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 07:10 UTCGHSA enrichment
  8. 2026-09-15 08:48 UTCGHSA enrichment
  9. 2026-09-14 10:26 UTCEG score recompute
  10. 2026-09-14 10:26 UTCGHSA enrichment
  11. 2026-09-13 12:04 UTCEG score recompute
  12. 2026-09-13 12:04 UTCGHSA enrichment
  13. 2026-09-12 15:02 UTCEPSS rescore
  14. 2026-09-12 13:42 UTCGHSA enrichment
  15. 2026-09-11 15:20 UTCEG score recompute
  16. 2026-09-11 15:20 UTCGHSA enrichment
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-10 16:58 UTCEG score recompute
  19. 2026-09-10 16:58 UTCGHSA enrichment
  20. 2026-09-10 16:57 UTCNVD updateCVSS v3 → 5.5
  21. 2026-09-10 09:35 UTCEPSS rescore
  22. 2026-09-09 19:16 UTCEG score recompute
  23. 2026-09-09 19:16 UTCGHSA enrichment
  24. 2026-09-08 22:01 UTCEPSS rescore
  25. 2026-09-08 20:54 UTCGHSA enrichment
Show 57 more
  1. 2026-09-07 16:12 UTCEG score recompute
  2. 2026-09-07 16:12 UTCGHSA enrichment
  3. 2026-09-06 15:52 UTCEG score recompute
  4. 2026-09-06 15:52 UTCGHSA enrichment
  5. 2026-09-06 13:48 UTCEPSS rescore
  6. 2026-09-05 17:29 UTCEG score recompute
  7. 2026-09-05 17:29 UTCGHSA enrichment
  8. 2026-09-04 19:05 UTCEG score recompute
  9. 2026-09-04 19:05 UTCGHSA enrichment
  10. 2026-09-03 20:33 UTCGHSA enrichment
  11. 2026-09-02 22:11 UTCEG score recompute
  12. 2026-09-02 22:11 UTCGHSA enrichment
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-01 23:13 UTCEG score recompute
  15. 2026-09-01 23:13 UTCGHSA enrichment
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 00:51 UTCGHSA enrichment
  18. 2026-08-31 02:29 UTCGHSA enrichment
  19. 2026-08-30 04:07 UTCEG score recompute
  20. 2026-08-30 04:07 UTCGHSA enrichment
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-29 05:41 UTCGHSA enrichment
  23. 2026-08-28 00:57 UTCEG score recompute
  24. 2026-08-28 00:57 UTCGHSA enrichment
  25. 2026-08-27 14:25 UTCEPSS rescore
  26. 2026-08-27 02:36 UTCEG score recompute
  27. 2026-08-27 02:36 UTCGHSA enrichment
  28. 2026-08-26 14:47 UTCEPSS rescore
  29. 2026-08-26 04:13 UTCGHSA enrichment
  30. 2026-08-25 05:52 UTCEG score recompute
  31. 2026-08-25 05:52 UTCGHSA enrichment
  32. 2026-08-24 14:18 UTCEPSS rescore
  33. 2026-08-24 07:30 UTCGHSA enrichment
  34. 2026-08-23 09:07 UTCEG score recompute
  35. 2026-08-23 09:07 UTCGHSA enrichment
  36. 2026-08-23 00:19 UTCEPSS rescore
  37. 2026-08-22 10:45 UTCEG score recompute
  38. 2026-08-22 10:45 UTCGHSA enrichment
  39. 2026-08-21 23:49 UTCEPSS rescore
  40. 2026-08-21 12:23 UTCEG score recompute
  41. 2026-08-21 12:23 UTCGHSA enrichment
  42. 2026-08-20 22:56 UTCEPSS rescore
  43. 2026-08-20 14:02 UTCEG score recompute
  44. 2026-08-20 14:02 UTCGHSA enrichment
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-19 15:20 UTCGHSA enrichment
  47. 2026-08-18 16:59 UTCEG score recompute
  48. 2026-08-18 16:59 UTCGHSA enrichment
  49. 2026-08-18 13:49 UTCEPSS rescore
  50. 2026-08-18 13:49 UTCEPSS rescore
  51. 2026-08-17 18:31 UTCEG score recompute
  52. 2026-08-17 18:31 UTCGHSA enrichment
  53. 2026-08-17 17:48 UTCEG score recompute
  54. 2026-08-17 17:47 UTCGHSA enrichment
  55. 2026-08-17 11:39 UTCEG score recompute
  56. 2026-08-17 11:13 UTCEG score recompute
  57. 2026-08-17 11:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74871?
CVE-2026-74871 is a medium vulnerability published on August 17, 2026. openssl_encrypt versions before 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last stage cancels out during key generation. When configured with a single KDF and no prior hashing stage, attackers can bypass memory-hard key derivation and perform offline password…
When was CVE-2026-74871 disclosed?
CVE-2026-74871 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74871 actively exploited?
CVE-2026-74871 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 99.8% of all scored CVEs.
What is the CVSS score of CVE-2026-74871?
CVE-2026-74871 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.2.
How do I remediate CVE-2026-74871?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74871, 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-2026-74871

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