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 71% 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
29%
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(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh2-1t64 (1.11.0-4.1ubuntu0.24.04.3) @ noble2026-07-27ubuntu

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.

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 24× in last 7d / 96× 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 101 total refreshes for this CVE.

  1. 2026-07-28 19:55 UTCEG score recompute
  2. 2026-07-28 19:55 UTCGHSA enrichment
  3. 2026-07-28 15:37 UTCEPSS rescore
  4. 2026-07-28 05:42 UTCGHSA enrichment
  5. 2026-07-27 16:58 UTCEG score recompute
  6. 2026-07-27 16:58 UTCGHSA enrichment
  7. 2026-07-27 14:14 UTCEPSS rescore
  8. 2026-07-27 03:06 UTCEG score recompute
  9. 2026-07-27 03:06 UTCVendor advisory
  10. 2026-07-27 03:05 UTCGHSA enrichment
  11. 2026-07-26 14:54 UTCEPSS rescore
  12. 2026-07-26 14:54 UTCEPSS rescore
  13. 2026-07-26 14:25 UTCEG score recompute
  14. 2026-07-26 14:25 UTCVendor advisory
  15. 2026-07-26 14:25 UTCGHSA enrichment
  16. 2026-07-25 14:18 UTCEPSS rescore
  17. 2026-07-25 14:18 UTCEPSS rescore
  18. 2026-07-24 14:18 UTCEPSS rescore
  19. 2026-07-24 14:18 UTCEPSS rescore
  20. 2026-07-23 14:18 UTCEPSS rescore
  21. 2026-07-23 14:18 UTCEPSS rescore
  22. 2026-07-23 03:20 UTCEG score recompute▲ 0.50
  23. 2026-07-22 14:08 UTCEPSS rescore
  24. 2026-07-22 14:08 UTCEPSS rescore
  25. 2026-07-20 17:08 UTCEPSS rescore
Show 75 more
  1. 2026-07-19 14:31 UTCEPSS rescore
  2. 2026-07-19 14:31 UTCEPSS rescore
  3. 2026-07-19 02:29 UTCEPSS rescore
  4. 2026-07-18 10:04 UTCEPSS rescore
  5. 2026-07-17 03:07 UTCGHSA enrichment
  6. 2026-07-16 17:03 UTCEPSS rescore
  7. 2026-07-16 14:27 UTCVendor advisory
  8. 2026-07-16 14:27 UTCGHSA enrichment
  9. 2026-07-16 01:44 UTCVendor advisory
  10. 2026-07-16 01:44 UTCGHSA enrichment
  11. 2026-07-15 16:57 UTCEPSS rescore
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 13:04 UTCGHSA enrichment
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-15 02:00 UTCEPSS rescore
  16. 2026-07-15 00:21 UTCVendor advisory
  17. 2026-07-15 00:21 UTCGHSA enrichment
  18. 2026-07-14 11:40 UTCGHSA enrichment
  19. 2026-07-13 22:58 UTCVendor advisory
  20. 2026-07-13 22:58 UTCGHSA enrichment
  21. 2026-07-13 22:31 UTCEPSS rescore
  22. 2026-07-13 10:18 UTCGHSA enrichment
  23. 2026-07-13 06:13 UTCEPSS rescore
  24. 2026-07-13 06:13 UTCEPSS rescore
  25. 2026-07-12 21:38 UTCGHSA enrichment
  26. 2026-07-12 08:58 UTCGHSA enrichment
  27. 2026-07-12 05:46 UTCEPSS rescore
  28. 2026-07-11 20:18 UTCGHSA enrichment
  29. 2026-07-11 08:27 UTCEPSS rescore
  30. 2026-07-11 08:27 UTCEPSS rescore
  31. 2026-07-11 07:38 UTCGHSA enrichment
  32. 2026-07-10 18:56 UTCGHSA enrichment
  33. 2026-07-10 06:15 UTCGHSA enrichment
  34. 2026-07-09 19:10 UTCEPSS rescore
  35. 2026-07-09 19:10 UTCEPSS rescore
  36. 2026-07-09 17:33 UTCGHSA enrichment
  37. 2026-07-09 04:48 UTCGHSA enrichment
  38. 2026-07-08 16:08 UTCGHSA enrichment
  39. 2026-07-08 15:16 UTCEPSS rescore
  40. 2026-07-08 15:16 UTCEPSS rescore
  41. 2026-07-08 03:28 UTCGHSA enrichment
  42. 2026-07-07 14:48 UTCGHSA enrichment
  43. 2026-07-07 13:46 UTCEPSS rescore
  44. 2026-07-07 13:46 UTCEPSS rescore
  45. 2026-07-07 01:44 UTCGHSA enrichment
  46. 2026-07-06 16:27 UTCEPSS rescore
  47. 2026-07-06 16:27 UTCEPSS rescore
  48. 2026-07-06 13:04 UTCGHSA enrichment
  49. 2026-07-06 02:23 UTCEPSS rescore
  50. 2026-07-06 02:23 UTCEPSS rescore
  51. 2026-07-06 00:21 UTCGHSA enrichment
  52. 2026-07-05 11:39 UTCGHSA enrichment
  53. 2026-07-05 02:31 UTCEPSS rescore
  54. 2026-07-05 02:30 UTCEPSS rescore
  55. 2026-07-04 22:56 UTCGHSA enrichment
  56. 2026-07-04 10:16 UTCGHSA enrichment
  57. 2026-07-04 06:31 UTCEPSS rescore
  58. 2026-07-04 06:31 UTCEPSS rescore
  59. 2026-07-03 21:35 UTCGHSA enrichment
  60. 2026-07-03 08:55 UTCGHSA enrichment
  61. 2026-07-02 20:14 UTCGHSA enrichment
  62. 2026-07-02 07:34 UTCGHSA enrichment
  63. 2026-07-01 18:53 UTCGHSA enrichment
  64. 2026-07-01 15:07 UTCEPSS rescore
  65. 2026-07-01 06:13 UTCGHSA enrichment
  66. 2026-06-30 23:22 UTCEPSS rescore
  67. 2026-06-30 20:33 UTCNVD updateCVSS v3 → 7.5
  68. 2026-06-30 17:32 UTCGHSA enrichment
  69. 2026-06-30 04:52 UTCGHSA enrichment
  70. 2026-06-29 16:11 UTCGHSA enrichment
  71. 2026-06-29 14:06 UTCEPSS rescore
  72. 2026-06-29 03:30 UTCGHSA enrichment
  73. 2026-06-28 14:50 UTCGHSA enrichment
  74. 2026-06-28 14:07 UTCEPSS rescore
  75. 2026-06-28 02:10 UTCEG score recompute

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 71.3% 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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