Security context

What an agent needs to avoid regressing past fixes and find the next vuln in this repo.

py-pdf/pypdf2

              main @ efc511b
            

Fixes

CVEs

HIGH

Peak severity

25.0%

Coverage

Highlights

Denial of Service: 12 prior fixes. Scrutinize any change in this area.

pypdf/filters.py: most-fixed (3 issues). Treat as high-risk during review.

3 high-severity fixes in this history; regressions here are high-impact.

Recurring patterns

The bug types that recur here, drawn from past fixes, not open vulnerabilities.

Denial of Service: Recursive page-tree structures within malformed PDFs can cause stack exhaustion and SIGSEGV crashes. This is mitigated by explicitly tracking visited node identifiers to detect cyclic references.

Denial of Service: Unbounded array lengths and output sizes inside PDF content streams allow attackers to trigger excessive memory consumption, causing service-wide out-of-memory crashes.

Denial of Service: The decompressors for compressed streams (such as FlateDecode, CCITTFaxDecode, and RunLengthDecode) are prone to CPU and memory exhaustion via integer overflows, division by zero, or uncontrolled decompression rates.