CVE-2021-46829Public exploit

Memory corruption via overflowing GIF frame offset

Published Jul 24, 2022 · Updated Aug 4, 2024

Heap buffer overflow in GNOME GdkPixbuf before 2.42.8 allows attackers to corrupt memory via a specially crafted GIF file. The composite_frame function in io-gif-animation.c stores a signed 32-bit row-offset calculation in an int, allowing large frame dimensions to wrap the offset and direct pixel writes outside the heap buffer. A user or automated system must open or preview the file; demonstrated outcomes include an application crash, while the controllable overwrite creates code-execution potential, especially on 32-bit systems.

CVSS severity7.8
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in GNOME GdkPixbuf before 2.42.8 allows attackers to corrupt memory via a specially crafted GIF file. The composite_frame function in io-gif-animation.c stores a signed 32-bit row-offset calculation in an int, allowing large frame dimensions to wrap the offset and direct pixel writes outside the heap buffer. A user or automated system must open or preview the file; demonstrated outcomes include an application crash, while the controllable overwrite creates code-execution potential, especially on 32-bit systems.

The record

CVE
CVE-2021-46829
Published
Jul 24, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.6Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-190Integer Overflow or Wraparound
T1204.002Malicious File

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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