{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58051 exists.","fix":"Apply the vendor's patch.","what":"CVE-2026-58051 is a high-severity use after free vulnerability in libssh2, published on 28 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-58051 and fix it if it is affected.\n\nWhat it is: CVE-2026-58051 is a high-severity use after free vulnerability in libssh2, published on 28 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58051 exists.\n\nAffected product: libssh2. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-58051/ (Markdown: https://insights.sbomify.com/CVE-2026-58051/index.md)","id":"CVE-2026-58051","markdown":"https://insights.sbomify.com/CVE-2026-58051/index.md","name":"CVE-2026-58051","record":{"aliases":["ALPINE-CVE-2026-58051","AZL-91385","AZL-97395","AZL-97437","BELL-CVE-2026-58051","DEBIAN-CVE-2026-58051","ECHO-b4f1-7845-4dda","GHSA-c5f3-hwj2-xp5p","JLSEC-2026-663","RHSA-2026:46535","UBUNTU-CVE-2026-58051"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"SSH client library","requires_auth":"none","summary":"A malicious SSH server can trigger a use-after-free in libssh2 clients via malformed publickey responses, potentially leading to code execution or crashes.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"libssh2","vendor":"libssh2"}],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"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"},"cwes":[{"id":"CWE-908","name":"Use of Uninitialized Resource"}],"description":"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.","ecosystems":["Red Hat:hummingbird:1"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"libssh2 - Free of Uninitialized Pointer in publickey List Cleanup","id":"CVE-2026-58051","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"7-Zip - Mark-of-the-Web Bypass via RAR5 Alternate Data Stream Name Collision","id":"CVE-2026-58052"},"packages":[{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.11.1-10.1.hum1"],"introduced":["0"],"last_affected":[],"package":"libssh2","purl":"pkg:rpm/redhat/libssh2","source":"RHSA-2026:46535"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.11.1-10.1.hum1"],"introduced":["0"],"last_affected":[],"package":"libssh2-devel","purl":"pkg:rpm/redhat/libssh2-devel","source":"RHSA-2026:46535"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.11.1-10.1.hum1"],"introduced":["0"],"last_affected":[],"package":"libssh2-docs","purl":"pkg:rpm/redhat/libssh2-docs","source":"RHSA-2026:46535"}],"prev":{"headline":"libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation","id":"CVE-2026-58050"},"products":["libssh2"],"published":"2026-06-28","related":[{"cvss_score":9.2,"headline":"libssh2 - Out-of-Bounds Write via Unchecked packet_length in transport.c","id":"CVE-2026-55200","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":8.7,"headline":"libssh2 Double-Free Heap Corruption via sftp_open()","id":"CVE-2026-66032","kev_date_added":null,"published":"2026-07-24"},{"cvss_score":8.7,"headline":"libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation","id":"CVE-2026-66033","kev_date_added":null,"published":"2026-07-24"},{"cvss_score":8.3,"headline":"libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation","id":"CVE-2026-58050","kev_date_added":null,"published":"2026-06-28"},{"cvss_score":8.3,"headline":"libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.c","id":"CVE-2025-15661","kev_date_added":null,"published":"2026-06-18"},{"cvss_score":8.2,"headline":"libssh2 - Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler","id":"CVE-2026-55199","kev_date_added":null,"published":"2026-06-17"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-29","vendors":["libssh2"]},"summary":"A malicious SSH server can trigger a use-after-free in libssh2 clients via malformed publickey responses, potentially leading to code execution or crashes.","url":"https://insights.sbomify.com/CVE-2026-58051/"}