Low severity3.3NVD Advisory· Published May 28, 2026· Updated May 29, 2026
CVE-2026-48156
CVE-2026-48156
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.12.0 | 6.12.0 |
Affected products
5- osv-coords3 versions
< 1.88.1-r1+ 2 more
- (no CPE)range: < 1.88.1-r1
- (no CPE)range: < 0.9.6-r4
- (no CPE)range: < 0.9.6-r4
Patches
Vulnerability mechanics
References
6- github.com/py-pdf/pypdf/pull/3791nvdIssue TrackingPatchWEB
- github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-248m-82v9-q6g6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-48156ghsaADVISORY
- github.com/py-pdf/pypdf/commit/507d7c9aa6ea83389b954b9c3c0c528fe5d5da70ghsaWEB
- github.com/py-pdf/pypdf/releases/tag/6.12.0nvdRelease NotesWEB
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