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CVE-2026-27171 is a denial-of-service vulnerability in zlib before version 1.3.2. The flaw affects the crc32_combine64 and crc32_combine_gen64 code paths because the internal x2nmodp routine can perform right shifts inside a loop that lacks a proper termination condition. Under conditions that reach these routines, the defect can cause non-terminating or excessively long computation, resulting in uncontrolled CPU consumption.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability in zlib addressed in Alpine Linux stable releases 3.20.10, 3.21.7, 3.22.4, and 3.23.4.
A vulnerability in the vendored zlib version referenced as one of several underlying issues affecting Compress::Raw::Zlib.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.