CVE-2026-27171

Name
CVE-2026-27171
Description
zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
cve@mitre.org https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/
cve@mitre.org https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf
cve@mitre.org https://github.com/madler/zlib/issues/904
cve@mitre.org https://github.com/madler/zlib/releases/tag/v1.3.2
cve@mitre.org https://ostif.org/zlib-audit-complete/

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:* zlib >= None < 1.3.2

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
zlib edge-main 1.3.2-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
zlib edge-main 1.3.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.3.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.3.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.3-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.3-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.3-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.2.12-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.2.12-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib edge-main 1.2.11-r4 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.23-main 1.3.2-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
zlib 3.23-main 1.3.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.22-main 1.3.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.22-main 1.2.12-r2 None possibly vulnerable
zlib 3.22-main 1.2.11-r4 None possibly vulnerable
zlib 3.21-main 1.3.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.21-main 1.2.12-r2 None possibly vulnerable
zlib 3.21-main 1.2.11-r4 None possibly vulnerable
zlib 3.20-main 1.3.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.20-main 1.2.12-r2 None possibly vulnerable
zlib 3.20-main 1.2.11-r4 None possibly vulnerable
zlib 3.19-main 1.3.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.19-main 1.3-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
zlib 3.19-main 1.2.12-r2 None possibly vulnerable
zlib 3.19-main 1.2.11-r4 None possibly vulnerable