CVE-2026-59938: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-59938
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-599380.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-59938 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for pypdf is a
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumGHSA-g9xf-7f8q-9mcj: pypdf: Possible infinite loop when processing threads/articles in writerghsa · 2026-07-09
- highCVE-2026-59936: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.1, an attacker can craf…nvd · 2026-07-08
- highCVE-2026-59935: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.2, an attacker can craf…nvd · 2026-07-08
- highCVE-2026-59937: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craf…nvd · 2026-07-08
- mediumCVE-2026-57204: pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafte…nvd · 2026-06-30
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