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Old version of zlib can cause high CPU usage
OESA-2026-1586
Summary
An older version of zlib is vulnerable to a security issue that can make the computer use too much CPU power. This could slow down your system or even cause it to freeze. Update to the latest version of zlib to fix this issue.
What to do
- Update zlib to version 1.2.13-5.oe2403sp3.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | zlib | <= 1.2.13-5.oe2403sp3 | 1.2.13-5.oe2403sp3 |
Original title
zlib security update
Original description
Security Fix(es):
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.(CVE-2026-27171)
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.(CVE-2026-27171)
- https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-27171 Vendor Advisory
Published: 15 Mar 2026 · Updated: 15 Mar 2026 · First seen: 15 Mar 2026