Vulnerability · Published May 28, 2026 · Assigned by GitHub_M
CVE-2026-48735pypdf: Manipulated XMP metadata streams can exhaust RAM
Medium 6.9
In plain English
A medium-severity resource allocation without limits in pypdf from py-pdf. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.1, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessary elements. This vulnerability is fixed in 6.12.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pypdf | no fix listed | DEBIAN-CVE-2026-48735 |
| Debian:13 | pypdf | no fix listed | DEBIAN-CVE-2026-48735 |
| Debian:14 | pypdf | 6.19.0-1 | DEBIAN-CVE-2026-48735 |
| Debian:12 | pypdf2 | no fix listed | DEBIAN-CVE-2026-48735 |
| PyPI | pypdf | 6.12.1 | GHSA-wjqc-6w8f-h24c |
| PyPI | pypdf | 6.12.1 | PYSEC-2026-3025 |
| Ubuntu:24.04:LTS | pypdf | no fix listed | UBUNTU-CVE-2026-48735 |
| Ubuntu:25.10 | pypdf | no fix listed | UBUNTU-CVE-2026-48735 |
| Ubuntu:26.04:LTS | pypdf | no fix listed | UBUNTU-CVE-2026-48735 |
| Ubuntu:26.10 | pypdf | no fix listed | UBUNTU-CVE-2026-48735 |
| Ubuntu:22.04:LTS | pypdf2 | no fix listed | UBUNTU-CVE-2026-48735 |
| Ubuntu:24.04:LTS | pypdf2 | no fix listed | UBUNTU-CVE-2026-48735 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-wjqc-6w8f-h24c x_refsource_CONFIRM
- https://github.com/py-pdf/pypdf/pull/3796 x_refsource_MISC
- https://github.com/py-pdf/pypdf/releases/tag/6.12.1 x_refsource_MISC