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CVE-2026-58051

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5ac6628b9480f5eb797a0782490eeb5efdf46a0aa669189303a2d7d4b306b220
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/metrics/1/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"libssh2","vendor":"libssh2","versions":[{"lessThanOrEqual":"1.11.1","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/metrics/1/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-908","description":"Use of Uninitialized Resource","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"Proof of Concept","tags":["exploit","third-party-advisory"],"url":"https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/references/0
{"name":"src/publickey.c","tags":["product"],"url":"https://github.com/libssh2/libssh2/blob/master/src/publickey.c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/references/1
{"name":"VulnCheck Advisory: libssh2 - Free of Uninitialized Pointer in publickey List Cleanup","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:db9037a448bedd4a975d8fbc53b1bfc5f1b1ed2c626fb5dce1c24bd410fc61b1 · sha256:005b2db606700706… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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