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MEDIUM severity

Comrak vulnerable to production of excessive output when parsing Markdown (GHSL-2023-048)GHSA-xxmq-4vph-956w

MEDIUMFix: kivikakk/comrak@70f97f3

GHSA-xxmq-4vph-956w is a medium-severity (CVSS 5.3) vulnerability in comrak. A fix is available for comrak — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Mar 28, 2023 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀comrak

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

Impact

comrak is vulnerable to the upstream cmark issue, "Issue revealed by fuzzer". A large number of references in a markdown document can trigger an overly large response.

Patches

0.17.0 contains https://github.com/kivikakk/comrak/commit/70f97f3ea4eae30ffbd1b94c764a3de2f1c41d2a, which limits reference output to a 100Kb maximum.

Workarounds

n/a

References

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iocomrakall versions0.17.0cargo update -p comrak --precise 0.17.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update comrak to 0.17.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xxmq-4vph-956w is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact comrak is vulnerable to the upstream cmark issue, ["Issue revealed by fuzzer"](https://github.com/commonmark/cmark/issues/354). A large number of references in a markdown document can trigger an overly large response. ### Patches 0.17.0 contains https://github.com/kivikakk/comrak/commit/70f97f3ea4eae30ffbd1b94c764a3de2f1c41d2a, which limits reference output to a 100Kb maximum. ### Workarounds n/a ### References * https://github.com/commonmark/cmark/issues/354
O3 Security · Impact-Aware SCA

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Comrak vulnerable to production of excessive output…