// For flags

CVE-2025-4948

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

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

This update for libsoup2 fixes the following issues. Fixed integer underflow in soup_multipart_new_from_message leading to denial of service. Fixed off-by-one out-of-bounds read may lead to infoleak. Fixed out of bounds reads in soup_headers_parse_request. Fixed NULL pointer dereference in the sniff_mp4 function in soup-content-sniffer.c. Fixed null pointer deference on client when server omits the realm parameter in an Unauthorized response with Digest authentication. Fixed double free on soup_message_headers_get_content_disposition via "params". Fixed NULL pointer dereference in SoupAuthDigest. Fixed NULL pointer dereference in soup_message_headers_get_content_disposition.

*Credits: Red Hat would like to thank fouzhe and zkbytes for reporting this issue.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2025-05-19 CVE Reserved
  • 2025-05-19 CVE Published
  • 2025-06-17 CVE Updated
  • 2025-06-20 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-191: Integer Underflow (Wrap or Wraparound)
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
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Oracle
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 Linux
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Affected
Red Hat
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 Enterprise Linux
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Redhat
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 Enterprise Linux
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Redhat
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 Rhel Aus
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Redhat
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 Rhel E4s
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Redhat
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 Rhel Eus
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Redhat
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 Rhel Tus
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Alma
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 Linux
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Amazon
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 Linux
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Fedoraproject
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 Fedora
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Opensuse
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 Leap
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Oracle
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 Linux
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Redhat
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Redhat
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Redhat
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 Rhel E4s
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Redhat
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 Rhel Els
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Redhat
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Redhat
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 Rhel Tus
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Suse
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 Sle-module-basesystem
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Suse
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Suse
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 Sle Hpc-ltss
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Suse
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 Sle Hpc
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Suse
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 Sled
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Suse
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 Sles-ltss-extended-security
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Suse
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Suse
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 Sles
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Suse
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 Sles Sap
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Suse
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 Suse-manager-proxy
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Suse
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Affected