DSA-6398-1 webkit2gtk - security update

CSIRTS triage

What

Multiple vulnerabilities have been discovered that may lead to unexpected process crashes or arbitrary JavaScript execution.

Who is affected

Users of WebKitGTK affected by the vulnerabilities.

Urgency

Remediation is important as these vulnerabilities could lead to severe impacts, although exploitation status is not confirmed.

Action

Users should apply the latest security updates provided by WebKitGTK.

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

Details

Source

Debian Security Advisories (INTL · vendor-psirt · site)

Severity

unknown

Published

2026-07-23

Exploitation

Not in CISA KEV at last sync

Original advisory: https://lists.debian.org/debian-security-announce/2026/msg00309.html

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.

• Exploitation likely imminentCVE-2024-4367EPSS puts this in the most-targeted tier (72.6% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 99% of all scored CVEs.
• Low exploitation riskCVE-2026-288470.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 45% of all scored CVEs.
• Low exploitation riskCVE-2026-288830.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
• Low exploitation riskCVE-2026-289010.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all scored CVEs.
• Low exploitation riskCVE-2026-289020.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all scored CVEs.
• Low exploitation riskCVE-2026-289030.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all scored CVEs.
• Low exploitation riskCVE-2026-289040.41% 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-2026-289050.41% 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-2026-289070.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all scored CVEs.
• Low exploitation riskCVE-2026-289420.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• medium[NEW] [medium] WebKitGTK: Multiple vulnerabilitiescert-bund
• medium[NEW] [medium] Apple Safari: Multiple vulnerabilitiescert-bund
• high[NEW] [high] Apple macOS (Tahoe, Sonoma, and Sequoia): Multiple vulnerabilitiescert-bund
• medium[NEW] [medium] Apple iOS and iPadOS: Multiple vulnerabilitiescert-bund
• unknownNCSC-2026-0267 [1.00] [M/H] Vulnerabilities fixed in Apple MacOSncsc-nl
• unknownNCSC-2026-0266 [1.00] [M/H] Vulnerabilities fixed in Apple iOS and iPadOSncsc-nl
• unknownApple Products Multiple Vulnerabilitieshkcert
• unknownMultiple vulnerabilities in Apple products (July 28, 2026)cert-fr-avis
• high[UPDATE] [high] WebKitGTK: Multiple vulnerabilitiescert-bund
• unknownApple Products Multiple Vulnerabilitieshkcert
• unknownNCSC-2026-0215 [1.00] [M/H] Vulnerabilities fixed in Apple iOS and iPadOSncsc-nl
• unknownNCSC-2026-0214 [1.00] [M/H] Vulnerabilities fixed in Apple MacOSncsc-nl

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