CVE-2026-103399
Libsoup: soupserver: http/1 request smuggling via undrained expect: 100-continue body
CVE-2026-103399 is fixed in 22 products on 1 platform, first by gir1.2-soup-2.4 2.62.1-1ubuntu0.4+esm10, released September 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
5.3
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0025
15th percentile
A flaw was found in SoupServer (libsoup). When an HTTP/1.x client sends a request with Expect: 100-continue and a request body, and SoupServer returns an early final (non-1xx) response before the body is read, the server neither drains the declared body bytes nor closes the connection. On a keep-alive connection, those leftover bytes are interpreted as a subsequent HTTP request. A remote, unauthenticated attacker can place a complete HTTP request in the body and cause SoupServer to process that smuggled request, leading to unintended request handling.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| gir1.2-soup-2.4 · Ubuntu 18.04.6 LTS (bionic) | 2.62.1-1ubuntu0.4+esm10 | gir1.2-soup-2.4 2.62.1-1ubuntu0.4+esm10 | Sep 30, 2026 |
| gir1.2-soup-2.4 · Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5+esm5 | gir1.2-soup-2.4 2.70.0-1ubuntu0.5+esm5 | Sep 30, 2026 |
| gir1.2-soup-2.4 · Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.10 | gir1.2-soup-2.4 2.74.2-3ubuntu0.10 | Sep 30, 2026 |
| gir1.2-soup-2.4 · Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.10 | gir1.2-soup-2.4 2.74.3-6ubuntu1.10 | Sep 30, 2026 |
| gir1.2-soup-2.4 · Ubuntu 26.04.1 LTS (resolute) | 2.74.3-10.1ubuntu5+esm4 | gir1.2-soup-2.4 2.74.3-10.1ubuntu5+esm4 | Sep 30, 2026 |
| gir1.2-soup-3.0 · Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | gir1.2-soup-3.0 3.0.7-0ubuntu1+esm10 | Sep 30, 2026 |
| gir1.2-soup-3.0 · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | gir1.2-soup-3.0 3.4.4-5ubuntu0.10 | Sep 30, 2026 |
| gir1.2-soup-3.0 · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | gir1.2-soup-3.0 3.6.6-1ubuntu0.2 | Sep 30, 2026 |
| libsoup · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup · opensuse-leap 16.0 | 3.6.6-160000.5.1 | OPENSUSE-SU-2026:22181-1 | Nov 7, 2026 |
| libsoup · sles 15.6 | 3.4.4-150600.3.62.1 | SUSE-SU-2026:5062-1 | Nov 7, 2026 |
| libsoup · sles 15.7 | 3.4.4-150600.3.62.1 | SUSE-SU-2026:5062-1 | Nov 7, 2026 |
| libsoup · sles 16.0 | 3.6.6-160000.5.1 | SUSE-SU-2026:24470-1 | Nov 7, 2026 |
| libsoup-2.4-1 · Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.10 | libsoup-2.4-1 2.74.3-6ubuntu1.10 | Sep 30, 2026 |
| libsoup-2.4-1 · Ubuntu 26.04.1 LTS (resolute) | 2.74.3-10.1ubuntu5+esm4 | libsoup-2.4-1 2.74.3-10.1ubuntu5+esm4 | Sep 30, 2026 |
| libsoup-3.0-0 · Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | libsoup-3.0-0 3.0.7-0ubuntu1+esm10 | Sep 30, 2026 |
| libsoup-3.0-0 · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | libsoup-3.0-0 3.4.4-5ubuntu0.10 | Sep 30, 2026 |
| libsoup-3.0-0 · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | libsoup-3.0-0 3.6.6-1ubuntu0.2 | Sep 30, 2026 |
| libsoup-3.0-common · Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | libsoup-3.0-common 3.0.7-0ubuntu1+esm10 | Sep 30, 2026 |
| libsoup-3.0-common · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | libsoup-3.0-common 3.4.4-5ubuntu0.10 | Sep 30, 2026 |
| libsoup-3.0-common · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | libsoup-3.0-common 3.6.6-1ubuntu0.2 | Sep 30, 2026 |
| libsoup-3.0-tests · Ubuntu 22.04.1 LTS (jammy) | 3.0.7-0ubuntu1+esm10 | libsoup-3.0-tests 3.0.7-0ubuntu1+esm10 | Sep 30, 2026 |
| libsoup-3.0-tests · Ubuntu 24.04.5 LTS (noble) | 3.4.4-5ubuntu0.10 | libsoup-3.0-tests 3.4.4-5ubuntu0.10 | Sep 30, 2026 |
| libsoup-3.0-tests · Ubuntu 26.04.1 LTS (resolute) | 3.6.6-1ubuntu0.2 | libsoup-3.0-tests 3.6.6-1ubuntu0.2 | Sep 30, 2026 |
| libsoup-debuginfo · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-debugsource · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-devel · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-doc · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-gnome-2.4-1 · Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.10 | libsoup-gnome-2.4-1 2.74.3-6ubuntu1.10 | Sep 30, 2026 |
| libsoup-gnome-2.4-1 · Ubuntu 26.04.1 LTS (resolute) | 2.74.3-10.1ubuntu5+esm4 | libsoup-gnome-2.4-1 2.74.3-10.1ubuntu5+esm4 | Sep 30, 2026 |
| libsoup-gnome2.4-1 · Ubuntu 18.04.6 LTS (bionic) | 2.62.1-1ubuntu0.4+esm10 | libsoup-gnome2.4-1 2.62.1-1ubuntu0.4+esm10 | Sep 30, 2026 |
| libsoup-gnome2.4-1 · Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5+esm5 | libsoup-gnome2.4-1 2.70.0-1ubuntu0.5+esm5 | Sep 30, 2026 |
| libsoup-gnome2.4-1 · Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.10 | libsoup-gnome2.4-1 2.74.2-3ubuntu0.10 | Sep 30, 2026 |
| libsoup2 · sles 15.6 | 2.74.3-150600.4.42.1 | SUSE-SU-2026:4703-1 | Nov 7, 2026 |
| libsoup2 · sles 15.7 | 2.74.3-150600.4.42.1 | SUSE-SU-2026:4703-1 | Nov 7, 2026 |
| libsoup2.4-1 · Ubuntu 18.04.6 LTS (bionic) | 2.62.1-1ubuntu0.4+esm10 | libsoup2.4-1 2.62.1-1ubuntu0.4+esm10 | Sep 30, 2026 |
| libsoup2.4-1 · Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5+esm5 | libsoup2.4-1 2.70.0-1ubuntu0.5+esm5 | Sep 30, 2026 |
| libsoup2.4-1 · Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.10 | libsoup2.4-1 2.74.2-3ubuntu0.10 | Sep 30, 2026 |
| libsoup2.4-common · Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.10 | libsoup2.4-common 2.74.2-3ubuntu0.10 | Sep 30, 2026 |
| libsoup2.4-common · Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.10 | libsoup2.4-common 2.74.3-6ubuntu1.10 | Sep 30, 2026 |
| libsoup2.4-common · Ubuntu 26.04.1 LTS (resolute) | 2.74.3-10.1ubuntu5+esm4 | libsoup2.4-common 2.74.3-10.1ubuntu5+esm4 | Sep 30, 2026 |
| libsoup2.4-tests · Ubuntu 20.04 LTS (focal) | 2.70.0-1ubuntu0.5+esm5 | libsoup2.4-tests 2.70.0-1ubuntu0.5+esm5 | Sep 30, 2026 |
| libsoup2.4-tests · Ubuntu 22.04.1 LTS (jammy) | 2.74.2-3ubuntu0.10 | libsoup2.4-tests 2.74.2-3ubuntu0.10 | Sep 30, 2026 |
| libsoup2.4-tests · Ubuntu 24.04.5 LTS (noble) | 2.74.3-6ubuntu1.10 | libsoup2.4-tests 2.74.3-6ubuntu1.10 | Sep 30, 2026 |
| libsoup2.4-tests · Ubuntu 26.04.1 LTS (resolute) | 2.74.3-10.1ubuntu5+esm4 | libsoup2.4-tests 2.74.3-10.1ubuntu5+esm4 | Sep 30, 2026 |
| libsoup3 · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-debuginfo · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-debugsource · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-devel · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-doc · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
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