Skip to content
Fencer Vulns
high 8.6

CVE-2026-1761 json

Libsoup: stack-based buffer overflow in libsoup multipart response parsingmultipart http response

published 2026-02-02 9 mo ago modified 2026-11-04 4 d ago also EUVD-2026-5104

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

A flaw was found in libsoup. This stack-based buffer overflow vulnerability occurs during the parsing of multipart HTTP responses due to an incorrect length calculation. A remote attacker can exploit this by sending a specially crafted multipart HTTP response, which can lead to memory corruption. This issue may result in application crashes or arbitrary code execution in applications that process untrusted server responses, and it does not require authentication or user interaction.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.9, 0:3.6.5-3.el10_1.10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.14
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.62.2-11.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:2.62.3-13.el8_10, 0:8.10-7
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.62.3-1.el8_2.8, 0:8.10-7.el8_2.1
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.62.3-2.el8_4.8, 0:8.10-7.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_4.8, 0:8.10-7.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.62.3-3.el8_8.8, 0:8.10-7.el8_8.1
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.62.3-3.el8_8.8, 0:8.10-7.el8_8.1
  • Red Hat Red Hat Enterprise Linux 9 0:2.72.0-12.el9_7.5
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.72.0-8.el9_0.9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.72.0-8.el9_2.10
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.72.0-8.el9_4.9
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.72.0-10.el9_6.6
  • Red Hat Red Hat OpenShift Dev Spaces (RHOSDS) 3.26 1770851052, 1770913862, 1770918006
  • libsoup3 RHEL 10.1 3.6.5-3.el10_1.10
  • libsoup RHEL 8 2.62.3-13.el8_10
  • libsoup RHEL 9 2.72.0-12.el9_7.5
  • spice-client-win RHEL 8 8.10-7.el8_10
  • spice-client-win-x64 RHEL 8 8.10-7.el8_10
  • spice-client-win-x86 RHEL 8 8.10-7.el8_10
  • libsoup3 RHEL 10.1 3.6.5-3.el10_1.9
  • libsoup RHEL 7 ELS 2.62.2-11.el7_9

red hat advisories RHSA-2026:2628RHSA-2026:2529RHSA-2026:2528RHSA-2026:2513RHSA-2026:2514RHSA-2026:2512

  • libsoup Linux Micro 6.1 3.4.4-slfo.1.1_7.1
  • libsoup SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 3.0.4-150400.3.31.1
  • libsoup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 2.74.3-150600.4.24.1
  • libsoup Linux Micro 6.0 3.4.2-12.1
  • libsoup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 2.74.2-150400.3.26.1
  • libsoup SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 3.4.4-150600.3.31.1
  • libsoup SLE Micro 5.2 2.68.4-150200.4.24.1
  • libsoup SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 3.6.5-160000.4.1

suse advisories SUSE-SU-2026:20649-1SUSE-SU-2026:0579-1SUSE-SU-2026:0574-1SUSE-SU-2026:20445-1SUSE-SU-2026:0497-1SUSE-SU-2026:0431-1

  • libsoup2 openSUSE Leap 16.0 2.74.3-160000.3.1
  • libsoup2 openSUSE Tumbleweed 2.74.3-15.1
  • libsoup openSUSE Leap 16.0 3.6.5-160000.4.1
  • libsoup openSUSE Tumbleweed 3.6.5-12.1

opensuse advisories openSUSE-SU-2026:20283-1openSUSE-SU-2026:10166-1openSUSE-SU-2026:20186-1openSUSE-SU-2026:10139-1

  • libsoup AlmaLinux 8 2.62.3-13.el8_10
  • libsoup AlmaLinux 9 2.72.0-12.el9_7.5

almalinux advisories ALSA-2026:2215ALSA-2026:2216

  • libsoup3 Rocky Linux 10 3.6.5-3.el10_1.10
  • libsoup Rocky Linux 9 2.72.0-12.el9_7.5
  • spice-client-win Rocky Linux 8 8.10-7.el8_10
  • libsoup Rocky Linux 8 2.62.3-13.el8_10
  • libsoup3 Rocky Linux 10 3.6.5-3.el10_1.9

rocky linux advisories RLSA-2026:2410RLSA-2026:2216RLSA-2026:2214RLSA-2026:2215RLSA-2026:2182

  • libsoup Azure Linux 3.0 3.4.4-12

azure linux advisories AZL-76697

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-2026-1761 updated cvss 8.6

libsoup: Stack-Based Buffer Overflow in libsoup Multipart Response Parsingmultipart HTTP response

  • Red Hat Enterprise Linux 6 libsoup
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) spice-client-win 8.10-7.el8_10, spice-client-win-x64 8.10-7.el8_10, spice-client-win-x86 8.10-7.el8_10
    fixed: vendor fix RHSA-2026:2215
  • Red Hat Enterprise Linux AppStream (v. 9) libsoup 2.72.0-12.el9_7.5
    fixed: vendor fix RHSA-2026:2216
  • Red Hat Enterprise Linux AppStream (v. 10) libsoup3 3.6.5-3.el10_1.9, libsoup3 3.6.5-3.el10_1.10
    fixed: vendor fix RHSA-2026:2410
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) spice-client-win 8.10-7.el8_2.1, spice-client-win-x64 8.10-7.el8_2.1, spice-client-win-x86 8.10-7.el8_2.1
    fixed: vendor fix RHSA-2026:2396
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) spice-client-win 8.10-7.el8_4.1, spice-client-win-x64 8.10-7.el8_4.1, spice-client-win-x86 8.10-7.el8_4.1
    fixed: vendor fix RHSA-2026:2402
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) spice-client-win 8.10-7.el8_6.1, spice-client-win-x64 8.10-7.el8_6.1, spice-client-win-x86 8.10-7.el8_6.1 Red Hat Enterprise Linux AppStream E4S (v.8.6) spice-client-win 8.10-7.el8_6.1, spice-client-win-x64 8.10-7.el8_6.1, spice-client-win-x86 8.10-7.el8_6.1
    fixed: vendor fix RHSA-2026:2512
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) spice-client-win 8.10-7.el8_8.1, spice-client-win-x64 8.10-7.el8_8.1, spice-client-win-x86 8.10-7.el8_8.1
    fixed: vendor fix RHSA-2026:1948
show 21 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) libsoup 2.72.0-8.el9_0.9
    fixed: vendor fix RHSA-2026:2008
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) libsoup 2.72.0-8.el9_2.10
    fixed: vendor fix RHSA-2026:2005
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libsoup3 3.6.5-3.el10_0.14
    fixed: vendor fix RHSA-2026:2006
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) libsoup 2.72.0-8.el9_4.9
    fixed: vendor fix RHSA-2026:2007
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libsoup 2.72.0-10.el9_6.6
    fixed: vendor fix RHSA-2026:2049
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) spice-client-win 8.10-7.el8_4.1, spice-client-win-x64 8.10-7.el8_4.1, spice-client-win-x86 8.10-7.el8_4.1
    fixed: vendor fix RHSA-2026:2402
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) spice-client-win 8.10-7.el8_6.1, spice-client-win-x64 8.10-7.el8_6.1, spice-client-win-x86 8.10-7.el8_6.1
    fixed: vendor fix RHSA-2026:2512
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) spice-client-win 8.10-7.el8_8.1, spice-client-win-x64 8.10-7.el8_8.1, spice-client-win-x86 8.10-7.el8_8.1
    fixed: vendor fix RHSA-2026:1948
  • Red Hat Enterprise Linux BaseOS (v. 8) libsoup 2.62.3-13.el8_10
    fixed: vendor fix RHSA-2026:2215
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) libsoup 2.62.3-1.el8_2.8
    fixed: vendor fix RHSA-2026:2396
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) libsoup 2.62.3-2.el8_4.8
    fixed: vendor fix RHSA-2026:2402
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) libsoup 2.62.3-2.el8_6.8 Red Hat Enterprise Linux BaseOS E4S (v.8.6) libsoup 2.62.3-2.el8_6.8
    fixed: vendor fix RHSA-2026:2512
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) libsoup 2.62.3-3.el8_8.8
    fixed: vendor fix RHSA-2026:1948
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) libsoup 2.62.3-2.el8_4.8
    fixed: vendor fix RHSA-2026:2402
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) libsoup 2.62.3-2.el8_6.8
    fixed: vendor fix RHSA-2026:2512
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) libsoup 2.62.3-3.el8_8.8
    fixed: vendor fix RHSA-2026:1948
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libsoup3-doc 3.6.5-3.el10_1.9, libsoup3-doc 3.6.5-3.el10_1.10
    fixed: vendor fix RHSA-2026:2410
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libsoup3-doc 3.6.5-3.el10_0.14
    fixed: vendor fix RHSA-2026:2006
  • Red Hat Enterprise Linux Server (v. 7 ELS) libsoup 2.62.2-11.el7_9
    fixed: vendor fix RHSA-2026:2628
  • Red Hat OpenShift Dev Spaces (RHOSDS) 3.26 devspaces 1770851052, devspaces 1770913862, devspaces 1770918006
    fixed: vendor fix RHSA-2026:2844
  • Red Hat OpenShift Dev Spaces (RHOSDS) 3.26 devspaces 1770332067, devspaces 1770404430, devspaces 1770404517, devspaces 1770404535, devspaces 1770494431, devspaces 1770494649, +5 more
    not affected: vulnerable code not present

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
9 mo ago

Exploit prediction

1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
CISA ADP 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat OpenShift Dev Spaces (RHOSDS) 3.26
  • Red Hat Red Hat Enterprise Linux 6

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

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.