CVE-2026-126546 Viber for iOS through 29.4.0.24 Denial of Service via Malformed GIF

5.3 mediumEPSS 0.3%

Medium (5.3) in rakuten viber viber for ios. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

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Severity
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Affected
Versions
References
Your exposure

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.

Severity

CVSS 4.0

5.3 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

4.3 medium

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

EPSS: 0.3% estimated probability of exploitation activity in the next 30 days; 22nd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC): Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-14. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE: CWE-248 Uncaught Exception
OWASP Top 10: A10:2025 Mishandling of Exceptional Conditions
Published: 2026-11-11 01:17 UTC
Modified: 2026-11-12 21:30 UTC
Assigned by: VulnCheck (CNA)
NVD analysis: Awaiting analysis
Record from: the NVD, synced 2026-11-12 21:59 UTC

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Affected

rakuten viber:viber for ios

Versions

From the CNA's record in the CVE List.

Product	Affected
Rakuten Viber Viber for iOS	through 29.4.0.24

References

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