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🐍 PyPI

GHSA-jm82-fx9c-mx94

pypdf: Missing stream length values ignore defined limits

Also known asCVE-2026-57204
Published
Jun 18, 2026
Updated
Jul 8, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed

Blast Radius

1 pkg affected
🐍pypdf

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

Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value.

Patches

This has been fixed in pypdf==6.13.3.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3871.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIpypdfall versions6.13.3

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pypdf. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update pypdf to 6.13.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-jm82-fx9c-mx94 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.

  4. How O3 protects you

    O3 pinpoints whether GHSA-jm82-fx9c-mx94 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-jm82-fx9c-mx94. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as `MAX_DECLARED_STREAM_LENGTH` is sometimes ignored. This requires parsing a content stream without a `/Length` value. ### Patches This has been fixed in [pypdf==6.13.3](https://github.com/py-pdf/pypdf/releases/tag/6.13.3). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3871](https://github.com/py-pdf/pypdf/pull/3871).
O3 Security · Impact-Aware SCA

Is GHSA-jm82-fx9c-mx94 in your dependencies?

O3 detects GHSA-jm82-fx9c-mx94 across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.