# CVE-2026-93313: Freedesktop Poppler JBIG2Stream.cc readCodeTableSeg integer overflow

> An integer overflow in Poppler's JBIG2Stream allows remote attackers to cause denial of service or potentially execute code via crafted PDF files.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 18 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-93313, ECHO-1b3a-1546-b4ee, GHSA-xj93-32pj-8pfj, RHSA-2026:71625, UBUNTU-CVE-2026-93313

## What is CVE-2026-93313?

CVE-2026-93313 is a medium-severity vulnerability in Freedesktop Poppler, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in Freedesktop Poppler 26.07.0. The impacted element is the function JBIG2Stream::readCodeTableSeg of the file poppler/JBIG2Stream.cc. Performing a manipulation results in integer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. The patch is named eb87cf711563894649bd0c365baa479401dc6d51. To fix this issue, it is recommended to deploy a patch.

Weakness: CWE-190 (Integer Overflow or Wraparound), CWE-189

## Which versions are affected by CVE-2026-93313?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `poppler` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-cpp` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-cpp-devel` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-devel` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-glib` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-glib-devel` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-glib-doc` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-qt6` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-qt6-devel` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |
| `poppler-utils` | Red Hat:hummingbird:1 | All versions | 0:26.08.0-1.1.hum1 |

## How do I fix CVE-2026-93313?

Apply the vendor's patch.

## Is CVE-2026-93313 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93313 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93313 and fix it if it is affected.

What it is: CVE-2026-93313 is a medium-severity vulnerability in Freedesktop Poppler, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93313 exists.

Affected product: Freedesktop Poppler. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-93313/ (Markdown: https://insights.sbomify.com/CVE-2026-93313/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93313
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93313
- OSV: https://osv.dev/vulnerability/CVE-2026-93313

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93313/
Summaries are generated and may contain mistakes; the official description above is the record.