CVE-2026-58051

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-28. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

June 28, 2026

Last Modified

June 30, 2026

Advisory Details (3)

Auto-updated Jun 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

libssh2 - Free of Uninitialized Pointer in publickey List Cleanup | Advisories | VulnCheck

https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup
generic

libssh2/src/publickey.c at master · libssh2/libssh2 · GitHub

https://github.com/libssh2/libssh2/blob/master/src/publickey.c
generic

exploitarium/libssh2-publickey-list-calc-poc at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc

Vendor Advisories for CVE-2026-58051(4)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh2-1t64 (1.11.0-4.1ubuntu0.24.04.3) @ noble2026-09-18ubuntu
redhatlibssh2-main-1.11.1-10.2.hum12026-07-27redhat
redhatlibssh2-main-1.11.1-10.1.hum12026-07-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libssh21.10.0-1 ... 1.9.0-3 (20 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libssh21.10.0-31.10.0-3+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libssh21.11.1-1 ... 1.11.1-6 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libssh21.11.1-1, 1.11.1-2, 1.11.1-3, 1.11.1-4, 1.11.1-51.11.1-6—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 54× 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 213 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-58051?
CVE-2026-58051 is a medium vulnerability published on June 28, 2026. libssh2 through 1.11.1 grows its publickey list with SSH2REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2publickeylistfree operating on an uninitialized entry. A malicious SSH server offering the publickey…
When was CVE-2026-58051 disclosed?
CVE-2026-58051 was first published in the National Vulnerability Database on June 28, 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-2026-58051 actively exploited?
CVE-2026-58051 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 79.7% of all scored CVEs.
What is the CVSS score of CVE-2026-58051?
CVE-2026-58051 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-58051?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58051, 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-2026-58051

Explore →

Is Your Infrastructure Affected by CVE-2026-58051?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs