ALPINE-CVE-2026-55199
- Source
- https://security.alpinelinux.org/vuln/CVE-2026-55199
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-55199.json
- JSON Data
- https://api.osv.dev/v1/vulns/ALPINE-CVE-2026-55199
- Upstream
- Published
- 2026-06-17T20:17:28.520Z
- Modified
- 2026-06-23T14:30:04.584156140Z
- Severity
-
- 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/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 1762685, contains a pre-authentication denial of service vulnerability in the SSHMSGEXTINFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nrextensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from libssh2get_string() are unchecked and the session timeout does not apply to CPU-bound loops.
- References
Affected packages
Alpine:v3.21 / libssh2
Package
- Name
- libssh2
- Purl
- pkg:apk/alpine/libssh2?arch=source
Alpine:v3.22 / libssh2
Package
- Name
- libssh2
- Purl
- pkg:apk/alpine/libssh2?arch=source
Alpine:v3.23 / libssh2
Package
- Name
- libssh2
- Purl
- pkg:apk/alpine/libssh2?arch=source