CVE-2026-0719VulnerabilityPublished 5 Feb 2026Updated 27 Jun 2026

Red Hat Security Advisory: libsoup3 security update

Affects Red Hat libsoup3Source GCVE Database

Mentioned vulnerabilities

CVE-2026-1761

Authoritative record:CVE-2026-0719· High 8.6

Not known to be exploited · CVSS 8.6 High : upgrade the Red Hat redhat/libsoup3 package to 10.0.1 soon.

Data as of 26 Oct 2026, 09:16 UTC

CVSS 3.1 base score

8.6High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 10.0.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade the Red Hat redhat/libsoup3 package to 10.0.1.

Affected software

Product	Affected	Fixed in
Red Hatredhat/libsoup3`pkg:rpm/redhat/libsoup3`Other threats	Affected <10.0.1	Fixed in 10.0.1

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AI-suggested

Red Hat has released security updates for libsoup3 in Red Hat Enterprise Linux 10.0 Extended Update Support and related CodeReady Linux Builder packages. Users should apply these official updates as detailed in Red Hat advisory RHSA-2026:2006 and the referenced article https://access.redhat.com/articles/11258. No alternative mitigations are indicated by the vendor advisory.

Description

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages. libsoup uses the Glib main loop and is designed to work well with GTK applications. This enables GNOME applications to access HTTP servers on the network in a completely asynchronous fashion, very similar to the Gtk+ programming model (a synchronous operation mode is also supported for those who want it), but the SOAP parts were removed long ago. Security Fix(es): * libsoup: Signed to Unsigned Conversion Error Leading to Stack-Based Buffer Overflow in libsoup NTLM Authentication (CVE-2026-0719) * libsoup: Stack-Based Buffer Overflow in libsoup Multipart Response Parsingmultipart HTTP response (CVE-2026-1761) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Impact

The vulnerabilities allow for stack-based buffer overflows, which can lead to memory corruption. This could potentially be exploited to cause application crashes or execute arbitrary code within the context of the affected application. The advisory rates the security impact as Important (high severity). There are no known exploits in the wild at the time of this advisory.

Summary

Libsoup3, a C-based HTTP library used in GNOME applications, contains two stack-based buffer overflow vulnerabilities. CVE-2026-0719 arises from a signed to unsigned conversion error in NTLM authentication, while CVE-2026-1761 involves a buffer overflow during multipart HTTP response parsing. These flaws could potentially lead to memory corruption. Red Hat has issued security updates for Red Hat Enterprise Linux 10.0 Extended Update Support and associated CodeReady Linux Builder variants to remediate these vulnerabilities.

CWE-121Stack-based Buffer Overflow (opens in a new tab)
Variant weaknessLikelihood of exploit: HighCWE Top 25 (2025): #14
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Implementation
Implement and perform bounds checking on input.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Jun 2026, 23:41 UTC

WeaknessesCWE-121

Technical details

References

Community reviews

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