CVE-2026-58050

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
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 - Integer Overflow in publickey Subsystem Attribute Allocation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/libssh2-integer-overflow-in-publickey-subsystem-attribute-allocation
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-2026-58050(3)

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) @ resolute2026-09-18ubuntu
redhatlibssh2-0:1.8.0-4.el7_9.22026-08-31redhat
redhatlibssh2-main-1.11.1-10.4.hum12026-08-12redhat

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

(2)

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 9× in last 7d / 56× 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 283 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-58050?
CVE-2026-58050 is a high vulnerability published on June 28, 2026. libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation numattrs * sizeof(libssh2publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A…
When was CVE-2026-58050 disclosed?
CVE-2026-58050 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-2026-58050 actively exploited?
CVE-2026-58050 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-58050?
CVE-2026-58050 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-58050?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58050, 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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