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Vulnerabilities

Vulnerability · ALSA-2026:83618

Important: libsoup3 security update

Published Oct 15, 2026 · catalog updated Oct 16, 2026 · Important: libsoup3 security update

Open the advisory

Exploitation likelihood is not on this record for ALSA-2026:83618. A missing EPSS score is not a low risk. Compare Important: libsoup3 security update with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Important: libsoup3 security update).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
AlmaLinux:10 libsoup3 · AlmaLinux:10 libsoup3-devel · AlmaLinux:10 libsoup3-doc

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. libsoup uses the Glib main loop and is designed to work well with GTK applications. This enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion, very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who want it), but the SOAP parts were removed long ago. Security Fix(es): * libsoup: libsoup: Heap buffer overflow via uninitialized length in data-URI base64 decoding (CVE-2026-102555) * libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion (CVE-2026-102556) * libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly (CVE-2026-102557) * libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth (CVE-2026-102558) * libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking (CVE-2026-102559) * libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth (CVE-2026-102560) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • AlmaLinux:10 libsoup30 → 3.6.5-3.el10_2.20
  • AlmaLinux:10 libsoup3-devel0 → 3.6.5-3.el10_2.20
  • AlmaLinux:10 libsoup3-doc0 → 3.6.5-3.el10_2.20

How to fix ALSA-2026:83618

  • Recommended remediation

    A patch or advisory reference is linked. Open the original publisher for availability by product version.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for ALSA-2026:83618. A missing EPSS score is not a low risk. Compare Important: libsoup3 security update with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 3.6.5-3.el10_2.20. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. libsoup uses the Glib main loop and is designed to work well with GTK applications. This enables GNOME applications to access HTTP servers on the network in a completely asynchronous

  2. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libsoup3 fixed in 3.6.5-3.el10_2.20; libsoup3-devel fixed in 3.6.5-3.el10_2.20; libsoup3-doc fixed in 3.6.5-3.el10_2.20

  3. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libsoup3 fixed in 3.6.5-3.el10_2.20

  4. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libsoup3-devel fixed in 3.6.5-3.el10_2.20

  5. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libsoup3-doc fixed in 3.6.5-3.el10_2.20

  6. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. libsoup uses the Glib main loop and is designed to work well with GTK applications. This enables GNOME applications to access HTTP servers on the network in a completely asynchronous

Sources

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.