High 7.1Published Oct 23, 2026

CVE-2026-115585pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)

Updated under an hour ago (Oct 28, 2026, 6:20 PM ET)

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It affects py-pdf pypdf. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.41%, higher than 35% of scored CVEs.

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Every CVE for py-pdf pypdf

Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-400, CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.41% (percentile 35)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 23, 2026
First seen by InfoSec Signals: Oct 23, 2026

Affected products

Affected products

py-pdf pypdf py_pdf:pypdf (from the name)	before 6.21.2	CNA record

References

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-jr96-gvgh-j3r4	x-refsource-confirm
https://github.com/py-pdf/pypdf/pull/4240	x-refsource-misc
https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b	x-refsource-misc
https://github.com/py-pdf/pypdf/releases/tag/6.21.2	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.