CVE-2026-46603Network attack vector

Remote service interruption via unused Huffman groups

Published Aug 14, 2026 · Updated Aug 14, 2026

Resource exhaustion in Go Project golang.org/x/image/vp8l before 0.45.0 allows remote attackers to exhaust memory with crafted VP8L images. The decoder.decodeHuffmanGroups routine sizes its Huffman-group slice from the largest 16-bit group index, allocating entries for unreferenced groups instead of only groups used by the tile map. Any application that passes an attacker-controlled VP8L image to Decode is exposed to application interruption and host memory pressure without authentication or user interaction.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Go Project golang.org/x/image/vp8l before 0.45.0 allows remote attackers to exhaust memory with crafted VP8L images. The decoder.decodeHuffmanGroups routine sizes its Huffman-group slice from the largest 16-bit group index, allocating entries for unreferenced groups instead of only groups used by the tile map. Any application that passes an attacker-controlled VP8L image to Decode is exposed to application interruption and host memory pressure without authentication or user interaction.

The record

CVE
CVE-2026-46603
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
golang.org/x/image
Product
golang.org/x/image/vp8l
Classifications
CWE-789, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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 <0.45.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

golang.org/x/image · golang.org/x/image/vp8lversion=0 <0.45.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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