CVE-2026-4985Public exploitNetwork attack vector

GIF corruption via overflowing frame pixel count

Published Mar 27, 2026 · Updated Mar 27, 2026

Integer overflow in CGIF 0.5.0 through 0.5.2 allows context-dependent attackers to corrupt generated GIF animations via oversized frame dimensions. In cgif_addframe, signed-int promotion of width multiplied by height can produce a negative loop bound, skip pixel comparison, and cause distinct frames to be treated as identical and discarded. Reachability requires a consuming application to accept attacker-influenced dimensions exceeding the signed-int limit, complete multi-gigabyte allocations, and enter the flagged frame-comparison path.

CVSS severity5.3
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Integer overflow in CGIF 0.5.0 through 0.5.2 allows context-dependent attackers to corrupt generated GIF animations via oversized frame dimensions. In cgif_addframe, signed-int promotion of width multiplied by height can produce a negative loop bound, skip pixel comparison, and cause distinct frames to be treated as identical and discarded. Reachability requires a consuming application to accept attacker-influenced dimensions exceeding the signed-int limit, complete multi-gigabyte allocations, and enter the flagged frame-comparison path.

The record

CVE
CVE-2026-4985
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
dloebl
Product
CGIF
Classifications
CWE-189, CWE-190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.5.0
  2. Affected versionversion=0.5.1
  3. Affected versionversion=0.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

dloebl · CGIFversion=0.5.0; version=0.5.1; version=0.5.2

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.3VulDBCVSS: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 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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-189Numeric Errors
CWE-190Integer Overflow or Wraparound

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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