CVE-2025-64702Network attack vector

Service interruption via unbounded QPACK header expansion

Published Dec 11, 2025 · Updated Dec 11, 2025

Resource exhaustion in quic-go before 0.57.0 allows remote attackers to crash HTTP/3 clients or servers with crafted QPACK headers. HTTP/3 header processing limits the compressed HEADERS frame but expands its fields into an http.Header without bounding decoded field-section size. Any malicious HTTP/3 peer can reach the symmetric client or server path, consuming memory until the affected process crashes or stops serving traffic.

CVSS severity5.3
Medium
EPSS probability0.36%
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 quic-go before 0.57.0 allows remote attackers to crash HTTP/3 clients or servers with crafted QPACK headers. HTTP/3 header processing limits the compressed HEADERS frame but expands its fields into an http.Header without bounding decoded field-section size. Any malicious HTTP/3 peer can reach the symmetric client or server path, consuming memory until the affected process crashes or stops serving traffic.

The record

CVE
CVE-2025-64702
Published
Dec 11, 2025
Updated
Dec 11, 2025
Vendor
quic-go
Product
quic-go
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2025Record 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=< 0.57.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

quic-go · quic-goversion=< 0.57.0

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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