CVE-2022-37434
Out-of-bounds Write: Is CVE-2022-37434 real, exploitable, or a false positive? Here's the community verdict.
signals
public sources
Moderate signals. Triage by your actual exposure and reachability.
public exploits
links to sources — we don’t host codeUnverified proof-of-concept code has been published. It may or may not be functional — assess before relying on it.
baseline read
auto · not a community verdict
Low signal — verdict needed
Few public signals point to active risk. Whether a scanner hit here is a true or false positive depends on your version and config — community verdicts decide.
Based on CVSS · FIRST EPSS
Confirm or dispute →CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field. NOTE: only applications that call inflateGetHeader are affected. Some common applications bundle the affected zlib source code but may be unable to call inflateGetHeader (e.g., see the nodejs/node reference).
References
Published
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Community ground truth
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In your experience, is this finding real and exploitable?
awaiting field verdictsCurated baseline: TruePositive's read from public sources is Couldn't reproduce — a starting point, not a community verdict.
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Field notes & remediation
Verdicts are the quick signal. Notes are the evidence and fixes behind them.
- 0
This is a real heap buffer over-read in zlib's inflate function, but it is only reachable when the application calls inflateGetHeader and then processes a gzip stream with an oversized header extra field. The vast majority of zlib users decompress data without ever calling inflateGetHeader, so the vulnerable path is dead for them even though scanners flag every pre-1.2.13 zlib.
How to check: search for inflateGetHeader use in your code. If it is not called, you cannot reach the bug.
Commonly flagged by: Trivy, Grype, Dependabot, OSV-Scanner.
- 0
The other side: for the small number of programs that do use inflateGetHeader with a custom extra-field buffer, this is a genuine memory-safety bug, so it is worth fixing there. The cannot-reproduce verdict reflects the common case, not those specific callers.
- 0
Update zlib to 1.2.13 or later, which is cheap and worth doing as hygiene. Prioritize it only if you actually use inflateGetHeader, otherwise treat it as a low-urgency version bump.
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