Description
The fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 14 | libsoup3 | 3.8.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libsoup2.4 | No fix yet | — |
| Ubuntu 26.10 | libsoup3 | 3.6.6-1ubuntu3 | — |
| Ubuntu 26.04 LTS | libsoup3 | 3.6.6-1ubuntu0.1 | — |
| Ubuntu 25.10 | libsoup3 +1 | No fix yet | — |
| Ubuntu 24.04 LTS | libsoup2.4 | 2.74.3-6ubuntu1.9 | — |
| Ubuntu 24.04 LTS | libsoup3 | 3.4.4-5ubuntu0.9 | — |
| Ubuntu 22.04 LTS | libsoup2.4 | 2.74.2-3ubuntu0.9 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | libsoup2.4 | 2.74.3-10.1ubuntu5+esm3 | — |
| Ubuntu Pro 22.04 LTS | libsoup3 | 3.0.7-0ubuntu1+esm9 | — |
| Ubuntu Pro 20.04 LTS | libsoup2.4 | 2.70.0-1ubuntu0.5+esm4 | — |
| Ubuntu Pro 18.04 LTS | libsoup2.4 | 2.62.1-1ubuntu0.4+esm9 | — |
| Ubuntu Pro 16.04 LTS | libsoup2.4 | 2.52.2-1ubuntu0.3+esm8 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libsoup +2 | 2.72.0-6.amzn2023.0.15 | ALAS2023-2026-3154 |
| Amazon Linux 2023 | libsoup3 +2 | 3.7.2-1.amzn2023 | ALAS2023-2026-3144 |
| Amazon Linux 2 | libsoup +1 | 2.56.0-6.amzn2.0.9 | ALAS2-2026-3970 |
Advisories 3
- ALAS2-2026-3970 Moderate: libsoup security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3154 Moderate: libsoup security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 12, 2026
- ALAS2023-2026-3144 Important: libsoup3 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 28, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-12549 vdb-entry
- cve-2026-0716 technical-description
- RHBZ#2489999 issue-tracking
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/516