CVE-2026-13758

LOWPre-NVD 3.73.7—
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory (severity: LOW) published 2026-06-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path.

The decrypt_done($tag) form compares it against the computed tag with memNE (memcmp() != 0), which short-circuits on the first differing byte, so its run time depends on the number of matching leading bytes. This affects all five AEAD modes: GCM, CCM, ChaCha20Poly1305, EAX and OCB. The one-shot *_decrypt_verify helpers are unaffected; they verify the tag inside libtomcrypt with a constant-time comparison.

The timing difference is a tag-verification oracle. An attacker who can submit many candidate tags for the same nonce, ciphertext and associated data while measuring the timing precisely enough may recover the expected tag byte by byte and forge a message that verifies.

CVSS v3
3.7
EG Score
3.7(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: 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
Severity37% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 30, 2026

References (3)

Vendor Advisories for CVE-2026-13758(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libcryptx-perl0.069-1 ... 0.090-1~bpo13+1 (21 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libcryptx-perl0.077-1 ... 0.091-1 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libcryptx-perl0.085-1 ... 0.091-1 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libcryptx-perl0.085-1, 0.087-1, 0.087-2, 0.088-10.089-1—

Weakness Classification(1)

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

Data Freshness Timeline

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

Frequently asked(5)

What is CVE-2026-13758?
CVE-2026-13758 is a low vulnerability published on June 29, 2026. CryptX versions before 0.088001 for Perl compare AEAD authentication tags in non-constant time in the streaming decryptdone path. The decryptdone($tag) form compares it against the computed tag with memNE (memcmp() != 0), which short-circuits on the first differing byte, so its run time depends on…
When was CVE-2026-13758 disclosed?
CVE-2026-13758 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13758 actively exploited?
CVE-2026-13758 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 66.1% of all scored CVEs.
What is the CVSS score of CVE-2026-13758?
CVE-2026-13758 has a CVSS v3.1 base score of 3.7 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-13758?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13758, 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.

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