CVE-2025-58189Network attack vector

Log injection via unquoted ALPN protocols

Published Oct 29, 2025 · Updated Oct 29, 2025

Log injection in Go standard library crypto/tls before 1.24.8 and 1.25.0 through 1.25.1 allows remote attackers to forge log content. The server-side negotiateALPN function formats the client protocol list with an unquoted %s conversion when Conn.Handshake rejects ALPN negotiation. Exploitation requires a program to log the returned handshake error without additional sanitization, allowing crafted protocol text to enter its logs.

CVSS severity5.3
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in Go standard library crypto/tls before 1.24.8 and 1.25.0 through 1.25.1 allows remote attackers to forge log content. The server-side negotiateALPN function formats the client protocol list with an unquoted %s conversion when Conn.Handshake rejects ALPN negotiation. Exploitation requires a program to log the returned handshake error without additional sanitization, allowing crafted protocol text to enter its logs.

The record

CVE
CVE-2025-58189
Published
Oct 29, 2025
Updated
Oct 29, 2025
Vendor
Go standard library
Product
crypto/tls
Classifications
CWE-532, T1562.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 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 <1.24.8
  2. Affected versionversion=1.25.0 <1.25.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · crypto/tlsversion=0 <1.24.8; version=1.25.0 <1.25.2

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-532Insertion of Sensitive Information into Log File
T1562.006Indicator Blocking

Public exploit references

No public exploit references are available in this record.

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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