CVE-2026-102999 · GHSA-v247-6f48-mgcj
pypdf: Possible long runtimes with large amount of embedded files
- Risk score
- 60/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 30 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it is
- pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application access…
- Affected
- pypdf (pip) < 6.19.0
- Fix
- Upgrade pypdf to 6.19.0 or later.
- Exploitation
- No known exploitation
Story map
At a glance
pypdf: Amber, patch this week. pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentiall…
The flaws
- CVE-2026-102999: Possible long runtimes with large amount of embedded files (CVSS 7.5 · EPSS 0%)
- CVE-2026-102993: Possible large memory usage when retrieving Roman page labels (CVSS 7.5 · EPSS 0%)
- CVE-2026-102998: Possible long runtimes when generating appearance streams (CVSS 7.5 · EPSS 0%)
- CVE-2026-103000: Possible large memory usage when retrieving alphabetical page labels (CVSS 7.5 · EPSS 0%)
The fix
Upgrade pypdf: 6.19.0 · 6.17.0 or later on your release line
Who is exposed: pypdf (pip) < 6.17.0
Where it stands
- No known exploitation
Connects to
- Same weakness: Denial of service (CWE-400). 250 other warnings in 30 days
- Same product: Earlier pypdf warnings. 4 in the last 90 days
Why it is Amber
- CVSS 7.5 high
- Remotely exploitable without logging in
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| pypdf | pip | < 6.19.0 | 6.19.0 |
References
- https://github.com/advisories/GHSA-v247-6f48-mgcj
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-v247-6f48-mgcj
- https://nvd.nist.gov/vuln/detail/CVE-2026-102999
- https://github.com/py-pdf/pypdf/pull/4081
- https://github.com/py-pdf/pypdf/commit/6b10556d13609a68f9ed18bb29fdd8bba88eb2c3
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0
- https://github.com/advisories/GHSA-v247-6f48-mgcj
Original description
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.
Last activity 30 Sep 2026. Patch Forecast updates every hour.