CVE-2026-102998pypdf: Possible long runtimes when generating appearance streams
Updated under an hour ago ()
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It affects py-pdf pypdf and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.34%, higher than 26% of scored CVEs.
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Free account, 1 product
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.
- CVSS
- 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.34% (percentile 26)
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
py-pdf pypdf py_pdf:pypdf (from the name) | before 6.19.0 | CNA record |
pypdf_project pypdf pypdf_project:pypdf | before 6.19.0 | NVD |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fjx-refsource-confirm, vendor-advisory
- https://github.com/py-pdf/pypdf/pull/4087x-refsource-misc, patch, issue-tracking
- https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7x-refsource-misc, patch
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0x-refsource-misc, release-notes
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.