CVE-2025-22868Network attack vector

Denial of service via unbounded token splitting

Published Feb 26, 2025 · Updated Feb 26, 2025

Denial of service in golang.org/x/oauth2/jws before 0.27.0 allows remote attackers to exhaust memory through a malformed JWS token. The Verify function split the entire attacker-controlled token before checking for exactly three segments, allowing excess periods to force an unbounded result slice. Any application that passes an unauthenticated token to Verify can suffer memory exhaustion and process termination, with no reported confidentiality or integrity impact.

CVSS severity7.5
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in golang.org/x/oauth2/jws before 0.27.0 allows remote attackers to exhaust memory through a malformed JWS token. The Verify function split the entire attacker-controlled token before checking for exactly three segments, allowing excess periods to force an unbounded result slice. Any application that passes an unauthenticated token to Verify can suffer memory exhaustion and process termination, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2025-22868
Published
Feb 26, 2025
Updated
Feb 26, 2025
Vendor
Google
Product
golang.org/x/oauth2/jws
Classifications
CWE-1286, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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 <0.27.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google · golang.org/x/oauth2/jwsversion=0 <0.27.0

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.

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

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-1286Improper Validation of Syntactic Correctness of Input
T1499.004Application 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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