Fluid Attacks Database

Description

pypdf: Manipulated RunLengthDecode streams can exhaust RAM

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter.

Patches

This has been fixed in pypdf==6.7.4.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3664.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
debian 11	pypdf2	=1.26.0-4 \|\| =1.26.0-4+deb11u1 \|\| =1.27.12-1 \|\| =1.27.9-1 \|\| =2.0.0-1 \|\| =2.10.0-1 \|\| =2.10.2-1 \|\| =2.10.3-1 \|\| =2.10.4-1 \|\| =2.10.5-1 \|\| =2.10.7-1 \|\| =2.10.9-1 \|\| =2.11.0-1 \|\| =2.11.1-1 \|\| =2.11.2-1 \|\| =2.12.1-1 \|\| =2.12.1-2 \|\| =2.12.1-3 \|\| =2.12.1-4 \|\| =2.4.1-1 \|\| =2.4.2-1 \|\| =2.6.0-1 \|\| =2.8.1-1 \|\| =2.9.0-1	-
pypi	pypdf	>=0 <6.7.4	6.7.4
debian 12	pypdf	=3.17.4-1 \|\| =3.4.1-1 \|\| =3.4.1-1+deb12u1 \|\| =4.0.0-1 \|\| =4.0.0-1~exp1 \|\| =4.0.1-1 \|\| =4.0.2-1 \|\| =4.1.0-1 \|\| =4.2.0-1 \|\| =4.3.1-1 \|\| =5.4.0-1 \|\| =6.9.0-1 \|\| =6.9.2-1	-
debian 14	pypdf	=5.4.0-1 \|\| >=0 <6.9.0-1	6.9.0-1
debian 12	pypdf2	=2.12.1-3 \|\| =2.12.1-3+deb12u1 \|\| =2.12.1-4	-
debian 13	pypdf	=5.4.0-1 \|\| =6.9.0-1 \|\| =6.9.2-1	-

Aliases

1. CVE-2026-283512. NVD-2026-283513. OSV-DEBIAN-2026-283514. OSV-2026-283515. GHSA-f2v5-7jq9-h8cg6. GCVE-2026-283517. SECURITY-TRACKER-CVE-2026-28351

References

1. https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg2. https://github.com/py-pdf/pypdf/pull/36643. https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc8584. https://github.com/py-pdf/pypdf/releases/tag/6.7.4

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