CVE-2018-25013Network attack vector

Memory disclosure or crash via decoder race

Published May 21, 2021 · Updated Aug 5, 2024

Heap-based buffer overflow in Google libwebp before 1.0.1 allows remote attackers to read memory or crash applications during image decoding. In DecodeRemaining, the decoder restores incremental-decoding context while a worker thread can still run, letting ShiftBytes read beyond heap bounds. Multithreaded incremental decoding must reach a suspended state; the bounded consequences are memory disclosure or an application crash.

CVSS severity9.1
Critical
EPSS probability2.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Google libwebp before 1.0.1 allows remote attackers to read memory or crash applications during image decoding. In DecodeRemaining, the decoder restores incremental-decoding context while a worker thread can still run, letting ShiftBytes read beyond heap bounds. Multithreaded incremental decoding must reach a suspended state; the bounded consequences are memory disclosure or an application crash.

The record

CVE
CVE-2018-25013
Published
May 21, 2021
Updated
Aug 5, 2024
Vendor
Google
Product
libwebp
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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

  1. Affected versionversion=libwebp 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google · libwebpversion=libwebp 1.0.1

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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