CVE-2026-1761: Libsoup: stack-based buffer overflow in libsoup multipart response parsingmultipart http response

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-02 · updated 2026-07-15
Weakness: CWE-121

Description

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.

Affected products

Red Hat Enterprise Linux 10: all versions — fixed in 0:3.6.5-3.el10_1.10, 0:3.6.5-3.el10_1.9
Red Hat Enterprise Linux 10.0 Extended Update Support: all versions — fixed in 0:3.6.5-3.el10_0.14
Red Hat Enterprise Linux 7 Extended Lifecycle Support: all versions — fixed in 0:2.62.2-11.el7_9
Red Hat Enterprise Linux 8: all versions — fixed in 0:2.62.3-13.el8_10, 0:8.10-7
Red Hat Enterprise Linux 8.2 Advanced Update Support: all versions — fixed in 0:2.62.3-1.el8_2.8, 0:8.10-7.el8_2.1
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: all versions — fixed in 0:2.62.3-2.el8_4.8, 0:8.10-7.el8_4.1
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: all versions — fixed in 0:2.62.3-2.el8_4.8, 0:8.10-7.el8_4.1
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: all versions — fixed in 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1
Red Hat Enterprise Linux 8.6 Telecommunications Update Service: all versions — fixed in 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions: all versions — fixed in 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1
Red Hat Enterprise Linux 8.8 Telecommunications Update Service: all versions — fixed in 0:2.62.3-3.el8_8.8, 0:8.10-7.el8_8.1
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: all versions — fixed in 0:2.62.3-3.el8_8.8, 0:8.10-7.el8_8.1
Red Hat Enterprise Linux 9: all versions — fixed in 0:2.72.0-12.el9_7.5
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions: all versions — fixed in 0:2.72.0-8.el9_0.9
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: all versions — fixed in 0:2.72.0-8.el9_2.10
Red Hat Enterprise Linux 9.4 Extended Update Support: all versions — fixed in 0:2.72.0-8.el9_4.9
Red Hat Enterprise Linux 9.6 Extended Update Support: all versions — fixed in 0:2.72.0-10.el9_6.6
Red Hat OpenShift Dev Spaces (RHOSDS) 3.26: all versions — fixed in sha256:25de67b5c2c60597173d977b2a09ecd14a9b2d60c4fd24ac0c8bf3c1ac6c000e, sha256:619c10386e0224e5228876a434c5b8d78d251bc383e2a9491503d6ceddd33c96, sha256:f3428de9e2ede29629694ab02ff8ca25543f3bc8a7300d1de95c00724e31c4b5

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:3.6.5-3.el10_1.10, 0:3.6.5-3.el10_1.9; Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.14; Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.62.2-11.el7_9; Red Hat Enterprise Linux 8 0:2.62.3-13.el8_10, 0:8.10-7; 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 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 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 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 Enterprise Linux 8.6 Telecommunications Update Service 0:2.62.3-2.el8_6.8, 0:8.10-7.el8_6.1; 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 Enterprise Linux 8.8 Telecommunications Update Service 0:2.62.3-3.el8_8.8, 0:8.10-7.el8_8.1; 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. Check the vendor advisory for mitigations.

References

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