PYSEC-2026-1831
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/pypdf/PYSEC-2026-1831.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-1831
- Aliases
- Published
- 2026-07-07T16:03:08.153838Z
- Modified
- 2026-07-07T17:46:59.105637375Z
- Severity
-
- 6.6 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U CVSS Calculator
- Summary
- pypdf can exhaust RAM via manipulated LZWDecode streams
- Details
-
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter.
Patches
This has been fixed in pypdf==6.1.3.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3502.
- References
-
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jfx9-29x2-rv3j
- https://nvd.nist.gov/vuln/detail/CVE-2025-62708
- https://github.com/py-pdf/pypdf/pull/3502
- https://github.com/py-pdf/pypdf/commit/e51d07807ffcdaf18077b9486dadb3dc05b368da
- https://github.com/py-pdf/pypdf
- https://github.com/py-pdf/pypdf/releases/tag/6.1.3
- https://pypi.org/project/pypdf
- https://github.com/advisories/GHSA-jfx9-29x2-rv3j
Affected packages
PyPI / pypdf
Package
- Name
- pypdf
- View open source insights on deps.dev
- Purl
- pkg:pypi/pypdf
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed6.1.3
Affected versions
1.*
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
1.13
3.*
3.1.0
3.2.0
3.2.1
3.3.0
3.4.0
3.4.1
3.5.0
3.5.1
3.5.2
3.6.0
3.7.0
3.7.1
3.8.0
3.8.1
3.9.0
3.9.1
3.10.0
3.11.0
3.11.1
3.12.0
3.12.1
3.12.2
3.13.0
3.14.0
3.15.0
3.15.1
3.15.2
3.15.3
3.15.4
3.15.5
3.16.0
3.16.1
3.16.2
3.16.3
3.16.4
3.17.0
3.17.1
3.17.2
3.17.3
3.17.4
4.*
4.0.0
4.0.1
4.0.2
4.1.0
4.2.0
4.3.0
4.3.1
5.*
5.0.0
5.0.1
5.1.0
5.2.0
5.3.0
5.3.1
5.4.0
5.5.0
5.6.0
5.6.1
5.7.0
5.8.0
5.9.0
6.*
6.0.0
6.1.0
6.1.1
6.1.2