Descriptionpypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case if the user extracted metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify `PyPDF2/generic/` to an an error throwing case. See GHSA-hm9v-vj3r-r55m for details.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
pypdf2 (PTS)buster1.26.0-2fixed
buster (security)1.26.0-2+deb10u2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pypdf2sourcebuster(not affected)
pypdf2sourcebullseye(not affected)


[bullseye] - pypdf2 <not-affected> (only version 2.10.5 is affected)
[buster] - pypdf2 <not-affected> (only version 2.10.5 is affected)
Fixed by: (2.10.6)

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