CVE-2025-4476
published 2025-05-16CVE-2025-4476: A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401…
PriorityP419medium4.3CVSS 3.1
AVNACLPRNUIRSUCNINAL
EPSS
0.34%
25.9th percentile
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | libsoup2.4 | < libsoup2.4 2.72.0-2+deb11u3 (bullseye) | libsoup2.4 2.72.0-2+deb11u3 (bullseye) |
| debian | libsoup3 | < libsoup2.4 2.72.0-2+deb11u3 (bullseye) | libsoup2.4 2.72.0-2+deb11u3 (bullseye) |
| msrc | azl3_libsoup_3.4.4-7_on_azure_linux_3.0 | — | — |
| msrc | cbl2_libsoup_3.0.4-7_on_cbl_mariner_2.0 | — | — |
| msrc | cm2_libsoup_3.0.4-7_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
osv7.5HIGH
vendor_ubuntu7.5HIGH
vendor_debian4.3MEDIUM
vendor_msrc4.3MEDIUM
vendor_redhat4.3MEDIUM
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Ubuntu
libsoup vulnerabilities
vendor_ubuntu·2025-05-28·CVSS 7.5
CVE-2025-32908 [HIGH] libsoup vulnerabilities
Title: libsoup vulnerabilities
Summary: libsoup could be made to crash if it received specially crafted network
traffic.
Jan Różański discovered that libsoup incorrectly handled certain headers
when sending HTTP/2 requests over TLS. An attacker could possibly use this
issue to cause a denial of service. This issue only affected libsoup3 in
Ubuntu 24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-32908)
Jan Różański discovered that libsoup incorrectly parsed certain response
headers. An attacker could possibly use this issue to cause a denial of
service. (CVE-2025-4476)
Instructions: In general, a standard system update will make all the necessary changes.
Microsoft
Libsoup: null pointer dereference in libsoup may lead to denial of service
vendor_msrc·2025-05-13·CVSS 4.3
CVE-2025-4476 [MEDIUM] CWE-476 Libsoup: null pointer dereference in libsoup may lead to denial of service
Libsoup: null pointer dereference in libsoup may lead to denial of service
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
redhat: redhat
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Ref
Red Hat
libsoup: Null pointer dereference in libsoup may lead to Denial Of Service
vendor_redhat·2025-05-08·CVSS 4.3
CVE-2025-4476 [MEDIUM] CWE-476 libsoup: Null pointer dereference in libsoup may lead to Denial Of Service
libsoup: Null pointer dereference in libsoup may lead to Denial Of Service
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.
A denial-of-service vulnerabili
Debian
CVE-2025-4476: libsoup2.4 - A denial-of-service vulnerability has been identified in the libsoup HTTP client...
vendor_debian·2025·CVSS 4.3
CVE-2025-4476 [MEDIUM] CVE-2025-4476: libsoup2.4 - A denial-of-service vulnerability has been identified in the libsoup HTTP client...
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.
Scope: local
bookworm: open
bullseye: resolved (fixed in 2.72.0-2+deb11u3)
trixie: open
OSV
libsoup3, libsoup2.4 vulnerabilities
osv·2025-05-28·CVSS 7.5
CVE-2025-32908 [HIGH] libsoup3, libsoup2.4 vulnerabilities
libsoup3, libsoup2.4 vulnerabilities
Jan Różański discovered that libsoup incorrectly handled certain headers
when sending HTTP/2 requests over TLS. An attacker could possibly use this
issue to cause a denial of service. This issue only affected libsoup3 in
Ubuntu 24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-32908)
Jan Różański discovered that libsoup incorrectly parsed certain response
headers. An attacker could possibly use this issue to cause a denial of
service. (CVE-2025-4476)
GHSA
GHSA-qgq4-89p9-qfrh: A denial-of-service vulnerability has been identified in the libsoup HTTP client library
ghsa_unreviewed·2025-05-16
CVE-2025-4476 [MEDIUM] CWE-476 GHSA-qgq4-89p9-qfrh: A denial-of-service vulnerability has been identified in the libsoup HTTP client library
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.
OSV
CVE-2025-4476: A denial-of-service vulnerability has been identified in the libsoup HTTP client library
osv·2025-05-16·CVSS 4.3
CVE-2025-4476 [MEDIUM] CVE-2025-4476: A denial-of-service vulnerability has been identified in the libsoup HTTP client library
A denial-of-service vulnerability has been identified in the libsoup HTTP client library. This flaw can be triggered when a libsoup client receives a 401 (Unauthorized) HTTP response containing a specifically crafted domain parameter within the WWW-Authenticate header. Processing this malformed header can lead to a crash of the client application using libsoup. An attacker could exploit this by setting up a malicious HTTP server. If a user's application using the vulnerable libsoup library connects to this malicious server, it could result in a denial-of-service. Successful exploitation requires tricking a user's client application into connecting to the attacker's malicious server.
No detection rules found.
No public exploits indexed.
2025-05-16
Published