Memory exhaustion via unbounded cookie structure allocation
Published Oct 29, 2025 · Updated Oct 29, 2025
Resource exhaustion in Go standard library net/http before 1.24.8 and 1.25.0 through 1.25.1 allows remote attackers to consume memory. Cookie parsing routines accept an unbounded number of tiny Cookie or Set-Cookie values within the 1 MB header limit and allocate a separate structure for each parsed cookie. Any Go HTTP client or server that parses attacker-controlled cookies is exposed to elevated memory use and a resulting service interrupt.
Summary
What happened
Resource exhaustion in Go standard library net/http before 1.24.8 and 1.25.0 through 1.25.1 allows remote attackers to consume memory. Cookie parsing routines accept an unbounded number of tiny Cookie or Set-Cookie values within the 1 MB header limit and allocate a separate structure for each parsed cookie. Any Go HTTP client or server that parses attacker-controlled cookies is exposed to elevated memory use and a resulting service interrupt.
The record
- CVE
- CVE-2025-58186
- Published
- Oct 29, 2025
- Updated
- Oct 29, 2025
- Vendor
- Go standard library
- Product
- net/http
- Classifications
- T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 29, 2025CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=0 <1.24.8
- Affected versionversion=1.25.0 <1.25.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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