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: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.2MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA 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
Severity62% × 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
0.1%
EPSS %ILE
1st
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 1.4.6 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 rangeFix by version rangeDependents
openssl-encrypt0.2.2 ... 1.4.5 (50 versions)
  • every version up to 1.4.6: fixed in 1.4.6
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 64× 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 114 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 16:25 UTCGHSA enrichment
  3. 2026-10-03 17:50 UTCGHSA enrichment
  4. 2026-10-02 15:47 UTCEG score recompute
  5. 2026-10-02 15:47 UTCGHSA enrichment
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-10-01 15:30 UTCGHSA enrichment
  8. 2026-10-01 08:28 UTCEG score recompute
  9. 2026-10-01 08:28 UTCGHSA enrichment
  10. 2026-09-30 10:04 UTCGHSA enrichment
  11. 2026-09-29 05:03 UTCEG score recompute
  12. 2026-09-29 05:03 UTCGHSA enrichment
  13. 2026-09-28 06:40 UTCGHSA enrichment
  14. 2026-09-27 08:18 UTCEG score recompute
  15. 2026-09-27 08:18 UTCGHSA enrichment
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-26 00:28 UTCEPSS rescore
  18. 2026-09-25 02:12 UTCEG score recompute
  19. 2026-09-25 02:12 UTCGHSA enrichment
  20. 2026-09-24 14:04 UTCEPSS rescore
  21. 2026-09-23 20:28 UTCEG score recompute
  22. 2026-09-23 20:28 UTCGHSA enrichment
  23. 2026-09-23 17:54 UTCEPSS rescore
  24. 2026-09-22 20:43 UTCEG score recompute
  25. 2026-09-22 20:43 UTCGHSA enrichment
Show 75 more
  1. 2026-09-22 16:01 UTCEPSS rescore
  2. 2026-09-21 22:10 UTCEG score recompute
  3. 2026-09-21 22:10 UTCGHSA enrichment
  4. 2026-09-21 21:09 UTCEPSS rescore
  5. 2026-09-20 23:47 UTCGHSA enrichment
  6. 2026-09-20 00:43 UTCEG score recompute
  7. 2026-09-20 00:43 UTCGHSA enrichment
  8. 2026-09-19 02:20 UTCGHSA enrichment
  9. 2026-09-18 03:54 UTCEG score recompute
  10. 2026-09-18 03:54 UTCGHSA enrichment
  11. 2026-09-17 05:32 UTCEG score recompute
  12. 2026-09-17 05:32 UTCGHSA enrichment
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 07:10 UTCGHSA enrichment
  15. 2026-09-15 08:48 UTCGHSA enrichment
  16. 2026-09-14 10:26 UTCEG score recompute
  17. 2026-09-14 10:26 UTCGHSA enrichment
  18. 2026-09-13 12:04 UTCEG score recompute
  19. 2026-09-13 12:04 UTCGHSA enrichment
  20. 2026-09-12 15:02 UTCEPSS rescore
  21. 2026-09-12 13:42 UTCGHSA enrichment
  22. 2026-09-11 15:20 UTCEG score recompute
  23. 2026-09-11 15:20 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 16:58 UTCEG score recompute
  26. 2026-09-10 16:58 UTCGHSA enrichment
  27. 2026-09-10 16:57 UTCNVD updateCVSS v3 → 5.5
  28. 2026-09-10 09:35 UTCEPSS rescore
  29. 2026-09-09 19:16 UTCEG score recompute
  30. 2026-09-09 19:16 UTCGHSA enrichment
  31. 2026-09-08 22:01 UTCEPSS rescore
  32. 2026-09-08 20:54 UTCGHSA enrichment
  33. 2026-09-07 16:12 UTCEG score recompute
  34. 2026-09-07 16:12 UTCGHSA enrichment
  35. 2026-09-06 15:52 UTCEG score recompute
  36. 2026-09-06 15:52 UTCGHSA enrichment
  37. 2026-09-06 13:48 UTCEPSS rescore
  38. 2026-09-05 17:29 UTCEG score recompute
  39. 2026-09-05 17:29 UTCGHSA enrichment
  40. 2026-09-04 19:05 UTCEG score recompute
  41. 2026-09-04 19:05 UTCGHSA enrichment
  42. 2026-09-03 20:33 UTCGHSA enrichment
  43. 2026-09-02 22:11 UTCEG score recompute
  44. 2026-09-02 22:11 UTCGHSA enrichment
  45. 2026-09-02 14:12 UTCEPSS rescore
  46. 2026-09-01 23:13 UTCEG score recompute
  47. 2026-09-01 23:13 UTCGHSA enrichment
  48. 2026-09-01 13:54 UTCEPSS rescore
  49. 2026-09-01 00:51 UTCGHSA enrichment
  50. 2026-08-31 02:29 UTCGHSA enrichment
  51. 2026-08-30 04:07 UTCEG score recompute
  52. 2026-08-30 04:07 UTCGHSA enrichment
  53. 2026-08-30 01:22 UTCEPSS rescore
  54. 2026-08-29 05:41 UTCGHSA enrichment
  55. 2026-08-28 00:57 UTCEG score recompute
  56. 2026-08-28 00:57 UTCGHSA enrichment
  57. 2026-08-27 14:25 UTCEPSS rescore
  58. 2026-08-27 02:36 UTCEG score recompute
  59. 2026-08-27 02:36 UTCGHSA enrichment
  60. 2026-08-26 14:47 UTCEPSS rescore
  61. 2026-08-26 04:13 UTCGHSA enrichment
  62. 2026-08-25 05:52 UTCEG score recompute
  63. 2026-08-25 05:52 UTCGHSA enrichment
  64. 2026-08-24 14:18 UTCEPSS rescore
  65. 2026-08-24 07:30 UTCGHSA enrichment
  66. 2026-08-23 09:07 UTCEG score recompute
  67. 2026-08-23 09:07 UTCGHSA enrichment
  68. 2026-08-23 00:19 UTCEPSS rescore
  69. 2026-08-22 10:45 UTCEG score recompute
  70. 2026-08-22 10:45 UTCGHSA enrichment
  71. 2026-08-21 23:49 UTCEPSS rescore
  72. 2026-08-21 12:23 UTCEG score recompute
  73. 2026-08-21 12:23 UTCGHSA enrichment
  74. 2026-08-20 22:56 UTCEPSS rescore
  75. 2026-08-20 14:02 UTCEG score recompute

Related CVEs(same product + same CWE)

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 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-2026-74871 actively exploited?
CVE-2026-74871 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-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 (MEDIUM).
How do I remediate CVE-2026-74871?
A fix for CVE-2026-74871 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74871 are linked in the Vendor Advisories panel on this page.

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