# CVE-2026-2369: Libsoup: libsoup: buffer overread due to integer underflow when handling zero-length resources

> An integer underflow in libsoup allows attackers to trigger buffer overreads, potentially exposing sensitive data or causing denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 19 Mar 2026
- **Updated:** 28 Apr 2026
- **Also known as:** AZL-80412, CLSA-2026-1777569045, CLSA-2026-1777659767, CLSA-2026-1778662869, CLSA-2026-1778772686, CLSA-2026-1778944149, DEBIAN-CVE-2026-2369, ECHO-6bbb-610c-309a, GHSA-rm63-3cv3-qm5w, ROOT-OS-DEBIAN-12-CVE-2026-2369, ROOT-OS-DEBIAN-13-CVE-2026-2369, UBUNTU-CVE-2026-2369

## What is CVE-2026-2369?

CVE-2026-2369 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 19 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in libsoup. An integer underflow vulnerability occurs when processing content with a zero-length resource, leading to a buffer overread. This can allow an attacker to potentially access sensitive information or cause an application level denial of service.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2026-2369?

It affects 1 product.


Products: Gnome Libsoup.

## How do I fix CVE-2026-2369?

Apply the vendor's patch.

## Is CVE-2026-2369 being exploited?

There is no known exploitation of CVE-2026-2369 in the wild and no public exploit code.

## Other vulnerabilities in Red Hat Enterprise Linux 10

- [CVE-2026-102556](https://insights.sbomify.com/CVE-2026-102556/): Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion (high 8.6)
- [CVE-2026-102557](https://insights.sbomify.com/CVE-2026-102557/): Libsoup: libsoup: heap buffer overflow during websocket message reassembly (high 8.6)
- [CVE-2026-102558](https://insights.sbomify.com/CVE-2026-102558/): Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth (high 8.6)
- [CVE-2026-102559](https://insights.sbomify.com/CVE-2026-102559/): Libsoup: libsoup: heap buffer overflow during websocket client-frame masking (high 8.6)
- [CVE-2026-102560](https://insights.sbomify.com/CVE-2026-102560/): Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2369 and fix it if it is affected.

What it is: CVE-2026-2369 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 19 Mar 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-2026-2369 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2026-2369/ (Markdown: https://insights.sbomify.com/CVE-2026-2369/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2369
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2369
- OSV: https://osv.dev/vulnerability/CVE-2026-2369

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2369/
Summaries are generated and may contain mistakes; the official description above is the record.