CVE catalog
CVE-2026-48156
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams wi
- Severity
- Medium · CVSS 5.1
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.12% · Oct 25, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | pypdf | sid | 6.21.1-1 | fixed |
| Debian | pypdf | forky | 6.21.1-1 | fixed |
| Debian | pypdf | trixie | 5.4.0-1 | vulnerable |
| Debian | pypdf | bookworm | 3.4.1-1+deb12u1 | vulnerable |
| Debian | pypdf2 | bookworm | 2.12.1-3+deb12u1 | vulnerable |
| Cpe | pypdf | Not reported | Not reported | vulnerable |
| Cpe | pypdf2 | Not reported | Not reported | vulnerable |
| Cpe | pypdf | Not reported | 6.12.0 | fixed |
| PyPI | pypdf | Not reported | 6.12.0 | fixed |
| Cpe | pypdf | Not reported | 6.12.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | pypdf | source | sid | 6.19.0-1 | not yet assigned | Not reported | [1138193] |
| Debian | pypdf | source | forky | 6.19.0-1 | not yet assigned | Not reported | [1138193] |
| Debian | pypdf | source | trixie | (unfixed) | not yet assigned | Not reported | [1138193] |
| Debian | pypdf | source | bookworm | (unfixed) | not yet assigned | Not reported | [1138193] |
| Debian | pypdf2 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | pypdf | cpe | Not reported | 6.12.0 | Not reported | Not reported | Not reported |
| PyPI | pypdf | PyPI | Not reported | 6.12.0 | Not reported | GHSA-248M-82V9-Q6G6 | Not reported |
| Cpe | pypdf | cpe | Not reported | 6.12.0 | Not reported | NVD-CVE-2026-48156 | Not reported |
Notes
[trixie] pypdf: Minor issue [bookworm] pypdf: Minor issue [bookworm] pypdf2: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-pypdf]Affected
Source package: [pypdf]
Details (2)
3.4.1-1+deb12u1· all · bookwormAffected
nvd · pypdf · debian · bookworm
3.4.1-1+deb12u1· all · bookwormAffected
nvd · pypdf · debian · bookworm
- [python3-pypdf2]Affected
Source package: [pypdf2]
Details (2)
2.12.1-3+deb12u1· all · bookwormAffected
nvd · pypdf2 · debian · bookworm
2.12.1-3+deb12u1· all · bookwormAffected
nvd · pypdf2 · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-48156]
- [https://osv.dev/vulnerability/CVE-2026-48156]
- [https://security-tracker.debian.org/tracker/CVE-2026-48156]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48156.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]