CVE-2026-57204: pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which lea
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-57204
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-2026-572040.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-57204 | 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
- mediumCVE-2026-59938: pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, 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
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