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Mozilla Firefox CVE-2026-16354

| EUVDEUVD-2026-46199 HIGH
Information Exposure (CWE-200)
2026-07-21 mozilla GHSA-29g8-xp94-2r42
Information Disclosure Red Hat Mozilla
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Network-delivered crafted image with low complexity and no auth, but a browser must render attacker content so UI:R; pure memory disclosure gives C:H, I:N, A:N.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
7.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 17:14 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
7.5 (HIGH)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
HIGH 7.5

DescriptionCVE.org

Information disclosure in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.

AnalysisAI

Information disclosure in Mozilla Firefox's ImageLib graphics component allows remote attackers to read sensitive data (likely uninitialized or out-of-bounds process memory) when a victim renders attacker-controlled image content, per the CWE-200 classification and the C:H CVSS impact. Affected builds are Firefox before 153 and the ESR 115.x and 140.x branches, all fixed by Mozilla in Firefox 153, ESR 115.38, and ESR 140.13. There is no public exploit identified at time of analysis and EPSS is low (0.15%, 5th percentile), consistent with a vendor-reported browser memory-disclosure issue rather than one under active exploitation.

Technical ContextAI

The flaw resides in ImageLib, the image-decoding subsystem Firefox (Gecko) uses to parse and rasterize formats such as PNG, JPEG, GIF, WebP, and AVIF before compositing them for display. CWE-200 (Exposure of Sensitive Information) in this context typically manifests as a decoder reading beyond validated buffer bounds or leaking uninitialized heap memory into the rendered or scriptable image surface (for example via canvas readback), letting an attacker exfiltrate adjacent process memory that may contain other page data, tokens, or address-space artifacts. Because image decoding is invoked automatically on content load, the attack surface is reachable through any pathway that renders a crafted image. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the desktop Firefox application and its ESR long-term-support channels as the affected product.

RemediationAI

Apply the vendor-released patch: upgrade to Firefox 153 on the mainline channel, or to Firefox ESR 115.38 or Firefox ESR 140.13 on the respective ESR channels, as documented in Mozilla advisories mfsa2026-68, mfsa2026-69, and mfsa2026-70 (https://www.mozilla.org/security/advisories/mfsa2026-68/, /mfsa2026-69/, /mfsa2026-70/). Firefox's built-in auto-update will remediate most endpoints; enterprises pinning ESR should push the updated ESR build through their management tooling. If patching must be deferred, compensating controls are limited but include reducing exposure to untrusted image content - for example disabling risky or experimental image decoders where configurable (such as toggling image.avif.enabled or a similar decode preference in about:config for the affected format, at the cost of breaking legitimate images in that format) and enforcing strict web filtering to block untrusted sites; these only reduce, not eliminate, exposure since common formats remain enabled, so patching is strongly preferred.

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Same weakness CWE-200 – Information Exposure

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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CVE-2026-16354 vulnerability details – vuln.today
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