# CVE-2026-12600: Uncontrolled memory usage in Innodata Labs’ Poppler JPX decoder

> Remote attackers can cause denial of service via memory exhaustion in Poppler's JPX decoder when processing crafted PDFs.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Aug 2026
- **Updated:** 26 Aug 2026
- **Also known as:** GHSA-c3v7-qg69-38rx

## What is CVE-2026-12600?

CVE-2026-12600 is a high-severity denial of service vulnerability in Poppler Innodata Labs, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Denial-of-service (DoS) vulnerability in the internal JPEG2000 (JPX) decoding implementation of the Poppler fork developed by Innodata Labs. When an application processes an untrusted PDF file containing specially crafted JPXDecode images, a remote attacker can cause uncontrolled memory consumption. The flaw occurs in the JPXStream::readCodestream() function, where values controlled from the SIZ segment (such as img.nComps) are used for the memory allocation of tiles and components without adequate validation. This allows an attacker to force excessive memory allocation and cause a resource exhaustion, ultimately causing the pdftoppm process to terminate due to out-of-memory (OOM) conditions.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-12600?


## How do I fix CVE-2026-12600?

No fix has been published for CVE-2026-12600 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12600 being exploited?

There is no known exploitation of CVE-2026-12600 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12600 and fix it if it is affected.

What it is: CVE-2026-12600 is a high-severity denial of service vulnerability in Poppler Innodata Labs, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12600 in the wild and no public exploit code.

Affected product: Poppler Innodata Labs. 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-2026-12600/ (Markdown: https://insights.sbomify.com/CVE-2026-12600/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12600
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12600
- OSV: https://osv.dev/vulnerability/CVE-2026-12600

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12600/
Summaries are generated and may contain mistakes; the official description above is the record.