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 (1.11.1-1ubuntu0.26.04.3) @ resolute2026-08-24ubuntu
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
libssh21.10.0-3 ... 1.11.1-5 (15 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libssh21.11.1-1 ... 1.11.1-5 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libssh21.11.1-1, 1.11.1-2, 1.11.1-3, 1.11.1-4, 1.11.1-5——

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 20× in last 7d / 103× 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 176 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 80.4% 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

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