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Fencer Vulns
medium 5.3

CVE-2026-77014 json

Libsoup: libsoup: integer truncation in sort_ranges() comparator causes silent omission of http range responses

published 2026-08-20 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-63225

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator in soup-message-headers.c truncates a 64-bit subtraction result to 32-bit int, flipping the sign for range offsets differing by more than INT_MAX. This causes silent omission of requested byte ranges from HTTP 206 Partial Content responses on resources larger than approximately 2 GB.

Patch / fix

  • libsoup3 Ubuntu 24.04 LTS 3.4.4-5ubuntu0.9
  • libsoup3 Ubuntu 26.10 3.6.6-1ubuntu3
  • libsoup3 Ubuntu 26.04 LTS 3.6.6-1ubuntu0.1
  • libsoup2.4 Ubuntu 22.04 LTS 2.74.2-3ubuntu0.9
  • libsoup2.4 Ubuntu 24.04 LTS 2.74.3-6ubuntu1.9
  • libsoup3 Ubuntu Pro 22.04 LTS 3.0.7-0ubuntu1+esm9
  • libsoup2.4 Ubuntu Pro 16.04 LTS 2.52.2-1ubuntu0.3+esm8
  • libsoup2.4 Ubuntu Pro 18.04 LTS 2.62.1-1ubuntu0.4+esm9

ubuntu advisories UBUNTU-CVE-2026-77014

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libsoup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 2.74.3-150400.3.43.1
  • libsoup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.74.3-150600.4.42.1

suse advisories SUSE-SU-2026:4739-1SUSE-SU-2026:4703-1

  • libsoup2 openSUSE Tumbleweed 2.74.3-23.1

opensuse advisories openSUSE-SU-2026:11860-1

  • libsoup Azure Linux 3.0 3.4.4-17

azure linux advisories AZL-97482

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-77014 updated cvss 5.3

libsoup: libsoup: Integer truncation in sort_ranges() comparator causes silent omission of HTTP Range responses

  • Red Hat Enterprise Linux 6 libsoup Red Hat Enterprise Linux 7 libsoup, gnome-clocks Red Hat Enterprise Linux 8 podman, libsoup, podman-tests, podman-docker, podman-remote, podman-gvproxy, +3 more Red Hat Enterprise Linux 9 podman, libsoup, podman-tests, podman-docker, podman-remote, podman-gvproxy, +2 more Red Hat Enterprise Linux 10 libsoup3 Red Hat OpenShift Container Platform 4 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +2 more
    affected: workaround, no fix available “No mitigation is available for this vulnerability.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

  • 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
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.