Bug 2571416 (CVE-2026-126546)

Summary: CVE-2026-126546 viber: viber: Denial of Service via crafted GIF image
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Viber for iOS. A remote attacker can cause a Denial of Service (DoS) by sending a specially crafted GIF image with invalid dimensions to a user. When the recipient views the malformed image, the application fails to validate the header data properly, causing the app to crash.
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Description OSIDB Bzimport 2026-11-11 01:11:45 UTC
Viber for iOS through 29.4.0.24 fails to validate the logical screen width and height in received GIF headers, allowing attackers to crash the app. Attackers can send a crafted GIF with zero dimensions that triggers an uncaught NSInternalInconsistencyException, aborting the app with SIGABRT when opened.