USN-8523-1: libsoup vulnerabilities

unknownCVE-2026-2369 CVE-2026-5119

Eric Su and Samuel Dainard discovered that libsoup incorrectly handled content with zero-length resources. An attacker could possibly use this issue to trigger a buffer over-read, resulting in information disclosure or a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-2369) Kona Arctic discovered that libsoup did not properly protect sensitive cookies when establishing HTTPS tunnels through an HTTP proxy. An attacker could possibly use this issue to intercept session cookies, resulting in session hijacking or user impersonation. (CVE-2026-5119)

CSIRTS triage

vendor: libsoup product: libsoup Information disclosure Denial of serviceaffected: Ubuntu 18.04 LTS, 20.04 LTS, 22.04 LTS, 24.04 LTS, 25.10, 26.04 LTS

What: Vulnerabilities in libsoup could lead to information disclosure and denial of service.
Who is affected: Users of libsoup on specified Ubuntu versions are affected.
Urgency: Remediation is important to prevent potential information disclosure and service disruption.
Action: Users should update libsoup to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8523-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-23690.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.
Low exploitation riskCVE-2026-51190.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-2369	coverage & exploitation status	NVD · CVE.org
CVE-2026-5119	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Red Hat Enterprise Linux (libsoup): Vulnerability allows information disclosurecert-bund