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Not in CISA KEV
HIGH severity

Integer Overflow/Infinite Loop in the http crateGHSA-x7vr-c387-8w57

HIGH

GHSA-x7vr-c387-8w57 is a high-severity (CVSS 7.5) remote code execution vulnerability in http. A fix is available for http — see the affected versions and patch details below.

Also known asCVE-2019-25008CVE-2020-25574GHSA-xvc9-xwgj-4cq9RUSTSEC-2019-0033
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Sep 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀http

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

HeaderMap::reserve() used usize::next_power_of_two() to calculate the increased capacity. However, next_power_of_two() silently overflows to 0 if given a sufficiently large number in release mode.

If the map was not empty when the overflow happens, the library will invoke self.grow(0) and start infinite probing. This allows an attacker who controls the argument to reserve() to cause a potential denial of service (DoS).

The flaw was corrected in 0.1.20 release of http crate.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iohttpall versions0.1.20cargo update -p http --precise 0.1.20

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for http, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update http to 0.1.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x7vr-c387-8w57 is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

Frequently Asked Questions

HeaderMap::reserve() used usize::next_power_of_two() to calculate the increased capacity. However, next_power_of_two() silently overflows to 0 if given a sufficiently large number in release mode. If the map was not empty when the overflow happens, the library will invoke self.grow(0) and start infinite probing. This allows an attacker who controls the argument to reserve() to cause a potential denial of service (DoS). The flaw was corrected in 0.1.20 release of http crate.
O3 Security · Impact-Aware SCA

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