Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M
CVE-2026-49461pypdf: Possible large memory usage for form XObjects during text extraction
Medium 6.9
In plain English
A medium-severity uncontrolled resource consumption 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 0.2% (higher than 7% 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 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references. This vulnerability is fixed in 6.12.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pypdf | no fix listed | DEBIAN-CVE-2026-49461 |
| Debian:13 | pypdf | no fix listed | DEBIAN-CVE-2026-49461 |
| Debian:14 | pypdf | 6.19.0-1 | DEBIAN-CVE-2026-49461 |
| Debian:12 | pypdf2 | no fix listed | DEBIAN-CVE-2026-49461 |
| PyPI | pypdf | 6.12.2 | GHSA-j543-4vmf-qm7v |
| PyPI | pypdf | 6.12.2 | PYSEC-2026-3020 |
| Ubuntu:24.04:LTS | pypdf | no fix listed | UBUNTU-CVE-2026-49461 |
| Ubuntu:25.10 | pypdf | no fix listed | UBUNTU-CVE-2026-49461 |
| Ubuntu:26.04:LTS | pypdf | no fix listed | UBUNTU-CVE-2026-49461 |
| Ubuntu:26.10 | pypdf | no fix listed | UBUNTU-CVE-2026-49461 |
| Ubuntu:22.04:LTS | pypdf2 | no fix listed | UBUNTU-CVE-2026-49461 |
| Ubuntu:24.04:LTS | pypdf2 | no fix listed | UBUNTU-CVE-2026-49461 |
Affected products (as reported)
Weakness: CWE-400 · 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-j543-4vmf-qm7v x_refsource_CONFIRM
- https://github.com/py-pdf/pypdf/pull/3805 x_refsource_MISC
- https://github.com/py-pdf/pypdf/releases/tag/6.12.2 x_refsource_MISC