pypdf is a free and open-source pure-python PDF library

Why it is Yellow

• CVSS 7.1 high
• Remotely exploitable without logging in
• On your watchlist: python

References

• https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a
• https://github.com/py-pdf/pypdf/pull/4289
• https://github.com/py-pdf/pypdf/releases/tag/6.21.4
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5

Original description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.