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Alerts This Week
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Mageia Libssh2 Critical DoS and Buffer Overflow Vuln 2026-0273

mageia
Calendar Grey July 20, 2026
Scroller Mageia
Critical security advisory for Mageia addressing multiple vulnerabilities in libssh2 including DoS and buffer issues.
Security update

Summary

Description: The updated packages fix security vulnerabilities: Heap Buffer Over-read via sftp_symlink() in sftp.c. (CVE-2025-15661) libssh2 userauth.c userauth_password integer overflow. (CVE-2026-7598) Pre-Authentication DoS via SSH_MSG_EXT_INFO Handler. (CVE-2026-55199) Out-of-Bounds Write via Unchecked packet_length in transport.c. (CVE-2026-55200) Integer Overflow in publickey Subsystem Attribute Allocation. (CVE-2026-58050) Free of Uninitialized Pointer in publickey List Cleanup. (CVE-2026-58051)

References

- https://bugs.mageia.org/show_bug.cgi?id=35616

- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NRU63FODXZBBO73NFWUI32A2A36ETDQZ/

- https://www.openwall.com/lists/oss-security/2026/06/23/10

- https://www.openwall.com/lists/oss-security/2026/06/23/11

- https://lists.debian.org/debian-security-announce/2026/msg00276.html

- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZREI4LITT4U2ZXPEEVVNALFKPLXGLAFM/

- https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/SRBHQ76PA4ZHTWY5F4ESYPYF3G2NLGWI/

- https://ubuntu.com/security/notices/USN-8486-1

- https://ubuntu.com/security/notices/USN-8532-1

- https://www.cve.org/CVERecord?id=CVE-2025-15661

- https://www.cve.org/CVERecord?id=CVE-2026-7598

- https://www.cve.org/CVERecord?id=CVE-2026-55199

- https://www.cve.org/CVERecord?id=CVE-2026-55200

- https://www.cve.org/CVERecord?id=CVE-2026-58050

- https://www.cve.org/CVERecord?id=CVE-2026-58051

Topics%20covered

Topics Covered

security advisory critical DoS integer overflow buffer over-read Mageia

Resolution

SRPMS

- 10/core/libssh2-1.11.1-2.1.mga10

- 9/core/libssh2-1.11.0-1.1.mga9

Severity
critical
Lowest
Low
Medium
High
Critical

Publication date: 20 Jul 2026
URL: https://advisories.mageia.org/MGASA-2026-0273.html
Type: security
CVE: CVE-2025-15661, CVE-2026-7598, CVE-2026-55199, CVE-2026-55200, CVE-2026-58050, CVE-2026-58051

Topics%20covered

Topics Covered

security advisory critical DoS integer overflow buffer over-read Mageia

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