Python
CVE-2026-22691
MEDIUM
GHSA-4f6g-68pf-7vhv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
3Blast Radius
ecosystem impact- 8 pypi packages depend on pypdf (7 direct, 1 indirect)
Ecosystem-wide dependent count for version 6.6.0.
DescriptionGitHub Advisory
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
AnalysisAI
pypdf versions prior to 6.6.0 are vulnerable to denial of service through CPU exhaustion when processing malformed PDF files with crafted startxref entries in non-strict reading mode. An attacker can create a specially crafted PDF containing excessive whitespace that causes the library to consume significant processing resources during cross-reference table reconstruction. A patch is available in version 6.6.0 and later.
Technical ContextAI
Classified as CWE-400 (Uncontrolled Resource Consumption). Affects Pypdf. pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in versi
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 6.6.0.. Restrict network access to the affected service where possible.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allVendor StatusVendor
SUSE
Severity: MediumShare
External POC / Exploit Code
Leaving vuln.today