CVE-2026-95127Public exploitNetwork attack vector

Application crash via subtitle bounding-box integer overflow

Published Oct 13, 2026 · Updated Oct 13, 2026

Integer overflow in libass 0.17.5 allows remote attackers to crash subtitle-rendering applications via extreme numeric ASS input. The ass_outline_construct() function in libass/ass_render.c subtracts attacker-influenced bounding-box extrema using signed 32-bit arithmetic that overflows. Applications must render the supplied subtitles; the demonstrated SIGILL crash requires nonrecovering UBSan instrumentation, while ordinary builds produce wrapped coordinates and sizes rather than a demonstrated crash.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in libass 0.17.5 allows remote attackers to crash subtitle-rendering applications via extreme numeric ASS input. The ass_outline_construct() function in libass/ass_render.c subtracts attacker-influenced bounding-box extrema using signed 32-bit arithmetic that overflows. Applications must render the supplied subtitles; the demonstrated SIGILL crash requires nonrecovering UBSan instrumentation, while ordinary builds produce wrapped coordinates and sizes rather than a demonstrated crash.

The record

CVE
CVE-2026-95127
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
libass
Product
libass
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

libass · libassversion=n/a

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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