CVE-2026-41168
pypdf is a free and open-source pure-python PDF library.
Published Apr 22, 2026 · corrected/updated Jun 17, 2026 · pypdf project pypdf · evidence confidence medium
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large values or object streams with wrong large values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-41168 is a medium public vulnerability record for pypdf project pypdf. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether pypdf project pypdf is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: pypdf project/pypdf. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 6.9. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-834. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Apr 22, 2026 · NIST NVD
Detected
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large values or object streams with wrong large values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.
Jun 17, 2026 · NIST NVD
Updated
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large values or object streams with wrong large values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.
Affected
- cpe pypdf project/pypdfversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-41168
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-41168
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large values or object streams with wrong large
nvd.nist.gov