CVE-2023-36193Public exploit

CLI crash via undersized option metadata allocation

Published Jun 23, 2023 · Updated Dec 2, 2024

Heap buffer over-read in Gifsicle 1.93 allows local users to crash the command-line process with an ambiguous numeric option. finish_string_list allocates metadata only for real list items, then adds a synthetic any integer item that ambiguity_error indexes without a corresponding Clp_InternOption entry. The documented --loopcount=- argument requires local command execution; the observed result is an AddressSanitizer abort, and Debian reports no security impact beyond the CLI crash.

CVSS severity7.8
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer over-read in Gifsicle 1.93 allows local users to crash the command-line process with an ambiguous numeric option. finish_string_list allocates metadata only for real list items, then adds a synthetic any integer item that ambiguity_error indexes without a corresponding Clp_InternOption entry. The documented --loopcount=- argument requires local command execution; the observed result is an AddressSanitizer abort, and Debian reports no security impact beyond the CLI crash.

The record

CVE
CVE-2023-36193
Published
Jun 23, 2023
Updated
Dec 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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