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CVE-2025-4948

Libsoup: integer underflow in soup_multipart_new_from_message() leading to denial of service in libsoup

publishedCWE-191

A flaw was found in the soup_multipart_new_from_message() function of the libsoup HTTP library, which is commonly used by GNOME and other applications to handle web communications. The issue occurs when the library processes specially crafted multipart messages. Due to improper validation, an internal calculation can go wrong, leading to an integer underflow. This can cause the program to access invalid memory and crash. As a result, any application or server using libsoup could be forced to exit unexpectedly, creating a denial-of-service (DoS) risk.

Technical severity7.5 highCVSS 3.1 · CNA: redhat
Published2025-05-19Source updated 2026-11-04
Collected2026-11-043 attributed sources

Fixes and workarounds

Workaround

To mitigate this issue, Red Hat recommends avoiding the use of libsoup with untrusted or unauthenticated multipart HTTP message sources until updated packages are available. Administrators can deploy application-level filters or HTTP proxies that reject malformed multipart requests. It is strongly advised to apply vendor-supplied patches as soon as they are released to address this integer underflow vulnerability and restore the stability of affected services.

Source: CNA: redhat

Affected products and versions

ProductVersionsAuthority


libsoup
https://gitlab.gnome.org/GNOME/libsoup 		≥ 0; ≤ 3.6.5 (affected, semver)
Other versions: unaffected 		CNA: redhat
Red Hat Enterprise Linux 10
Red Hat
libsoup3
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:3.6.5-3.el10_0.6; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 7 Extended Lifecycle Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.2-9.el7_9; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-9.el8_10; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-1.el8_2.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-2.el8_4.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-2.el8_6.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-2.el8_6.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-2.el8_6.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8.8 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.62.3-3.el8_8.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 9
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.72.0-10.el9_6.2; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.72.0-8.el9_0.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 9.2 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.72.0-8.el9_2.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 9.4 Extended Update Support
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:2.72.0-8.el9_4.5; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 6
Red Hat
libsoup
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: unknown 		CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 7.5
high		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCNA: redhat
3.1 / 7.5
high		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD: [email protected]

Exploit evidence

References

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