CVE-2026-33123Medium· 4.3▾ SunlitA flaw was found in pypdf, a pure-python PDF library. An attacker can craft a malicious PDF file that, when processed, leads to excessive resource consumption, causing long runtimes and high memory usage. This can result in a Denial of Ser…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 23.7 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
Last analysed / modified upstream
— → 4.3
0.3% → 0.4%
A flaw was found in pypdf, a pure-python PDF library. An attacker can craft a malicious PDF file that, when processed, leads to excessive resource consumption, causing long runtimes and high memory usage. This can result in a Denial of Service (DoS) condition, making the application unresponsive or unstable.
pypdf: pypdf: Denial of Service due to excessive resource consumption from crafted PDF — rated Moderate by Red Hat. Released 2026-03-20, updated 2026-10-15.
Affected:
No fix planned:
Fix deferred
Workarounds / mitigations:
Affected packages:
pypdf < 6.9.1Patched in:
pypdf 6.9.1Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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CVE-2026-28351Medium· 6.5pypdf: pypdf: Denial of Service via crafted PDF with RunLengthDecode filter (CVE-2026-28351)
CVE-2026-28804Medium· 6.5pypdf: pypdf: Denial of Service via crafted PDF with ASCIIHexDecode filter (CVE-2026-28804)
CVE-2026-27888Medium· 5.3pypdf: pypdf: Denial of Service via crafted PDF (CVE-2026-27888)
CVE-2026-27025Medium· 6.5pypdf: pypdf: Denial of Service via crafted PDF with large font values (CVE-2026-27025)
CVE-2026-27026Medium· 6.5pypdf: pypdf: Denial of Service via malformed PDF /FlateDecode stream (CVE-2026-27026)