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CVE-2026-115585

pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)

HIGH
7.1
CVSS Score
Published: October 23, 2026 at 07:31 PM UTC
Updated: October 30, 2026 at 04:17 PM UTC
1 product affected across 1 vendorPypdf

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Severity
HIGH7.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Pypdf· Py PDF
90%
v < 6.21.2

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jr96-gvgh-j3r4
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/pull/4240
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b
x_refsource_MISC
Source: cverecord
https://github.com/py-pdf/pypdf/releases/tag/6.21.2

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-400CWE-407

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