pypdf possibly has long runtimes for malformed FlateDecode streams

보통 5.5CVE-2026-27026 · GHSA-9mvc-8737-8j8h · PYSEC-2026-3015 · Published 20/02/2026 · updated 17/06/2026

요약

CVE-2026-27026은(는) pypdf, pypdf (pypdf project)에 영향을 주는 보통 (CVSS 5.5) 취약점입니다.
향후 30일 내 악용 확률(EPSS): 0.19%, 전체 취약점의 8.8%보다 높음.
조치: 6.7.1 이상으로 업데이트하세요.

Package	Affected versions	Patched versions
pypdf PyPI	`< 6.7.1`	`6.7.1`
pypdf pypdf_project	`< 6.7.1`	`6.7.1`

Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used.

Patches

This has been fixed in pypdf==6.7.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3644.

NVD description

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

References

py-pdf/pypdf security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-27026 · ADVISORY
py-pdf/pypdf#3644 · WEB
py-pdf/pypdf commit 7905842 · WEB
py-pdf/pypdf · PACKAGE
py-pdf/pypdf release 6.7.1 · WEB
pypi.org/project/pypdf · PACKAGE
GitHub Advisory GHSA-9mvc-8737-8j8h · ADVISORY

pypdf의 다른 취약점

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Package

Affected versions

Patched versions

pypdf

PyPI

< 6.7.1

6.7.1

pypdf

pypdf_project

< 6.7.1

6.7.1

Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used.

Patches

This has been fixed in pypdf==6.7.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3644.

NVD description

pypdf의 다른 취약점

모두 보기 →