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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libsoup | < 3.6.5 | 3.6.5 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | libsoup3 | 3.6.5-2 | — |
| Debian 12 | libsoup3 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | libsoup2.4 | 2.74.3-6ubuntu1.5 | USN-7543-1 |
| Ubuntu 24.04 LTS | libsoup3 | 3.4.4-5ubuntu0.4 | USN-7543-1 |
| Ubuntu 22.04 LTS | libsoup2.4 | 2.74.2-3ubuntu0.5 | USN-7543-1 |
| Ubuntu 20.04 LTS | libsoup2.4 | 2.70.0-1ubuntu0.5 | USN-7543-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | libsoup3 | 3.0.7-0ubuntu1+esm4 | USN-7543-1 |
| Ubuntu Pro 18.04 LTS | libsoup2.4 | 2.62.1-1ubuntu0.4+esm4 | USN-7543-1 |
| Ubuntu Pro 16.04 LTS | libsoup2.4 | 2.52.2-1ubuntu0.3+esm3 | USN-7543-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | libsoup3 +2 | 3.6.5-3.el10_0 | RHSA-2025:7505 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | libsoup3 +2 | 3.6.5-3.el10_0 | ALSA-2025:7505 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libsoup | 3.4.4-150600.3.7.1 | SUSE-SU-2025:01504-1 |
| SLES 15 SP6 | libsoup | 3.4.4-150600.3.7.1 | SUSE-SU-2025:1504-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | libsoup | 3.4.4-slfo.1.1_3.1 | SUSE-SU-2025:20446-1 |
| SLE Micro 6.0 | libsoup | 3.4.2-6.1 | SUSE-SU-2025:20375-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libsoup | 3.6.5-2.1 | openSUSE-SU-2025:15015-1 |
| openSUSE Leap 15.6 | libsoup | 3.4.4-150600.3.7.1 | SUSE-SU-2025:1504-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libsoup3 +2 | 3.6.5-48.amzn2023 | ALAS2023-2025-961 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libsoup | 3.4.4-4 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | libsoup3 +2 | 3.6.5-3.el10_0.6 | ELSA-2025-7505 |
Advisories 10
- ALSA-2025:7505 Important: libsoup3 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:7505 Red Hat Security Advisory: libsoup3 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- USN-7543-1 libsoup3, libsoup2.4 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- SUSE-SU-2025:20446-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20375-1 Security update for libsoup SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01504-1 Security update for libsoup SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1504-1 Security update for libsoup SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:15015-1 libsoup-3_0-0-3.6.5-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2025-7505 Important: libsoup3 security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ALAS2023-2025-961 Important: libsoup3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 13, 2025