DEBIAN-CVE-2026-66034
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-66034
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-66034.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-66034
- Upstream
- Published
- 2026-07-24T17:17:35Z
- Modified
- 2026-09-12T10:00:28Z
- Severity
-
- 7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
- Summary
- [none]
- Details
-
libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region.
- References
Affected packages
Debian:12 / libssh2
Package
- Name
- libssh2
- Purl
- pkg:deb/debian/libssh2?arch=source&distro=bookworm
Debian:13 / libssh2
Package
- Name
- libssh2
- Purl
- pkg:deb/debian/libssh2?arch=source&distro=trixie
Debian:14 / libssh2
Package
- Name
- libssh2
- Purl
- pkg:deb/debian/libssh2?arch=source&distro=forky