Fluid Attacks Database

Description

pypdf: Possible long runtimes/large memory usage when parsing indirect objects

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires reading a PDF document with long indirect object headers, not terminated by whitespace.

Patches

This has been fixed in pypdf==6.18.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4055.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
pypi	pypdf	>=0 <6.18.0	6.18.0
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 \|\| =6.19.0-1 \|\| =6.9.0-1 \|\| =6.9.2-1 \|\| =6.9.2-2	-
debian 14	pypdf	=5.4.0-1 \|\| =6.9.0-1 \|\| =6.9.2-1 \|\| =6.9.2-2 \|\| >=0 <6.19.0-1	6.19.0-1
debian 13	pypdf	=5.4.0-1 \|\| =6.19.0-1 \|\| =6.9.0-1 \|\| =6.9.2-1 \|\| =6.9.2-2	-
debian 12	pypdf2	=2.12.1-3 \|\| =2.12.1-3+deb12u1 \|\| =2.12.1-4	-

Aliases

1. CVE-2026-1029942. NVD-2026-1029943. OSV-2026-1029944. OSV-DEBIAN-2026-1029945. GHSA-5jq2-8x83-x2466. GCVE-2026-1029947. SECURITY-TRACKER-CVE-2026-102994

References

1. https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x2462. https://github.com/py-pdf/pypdf/pull/40553. https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9e4. https://github.com/py-pdf/pypdf/releases/tag/6.18.0

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