What’s Vulnerable › Vulnerabilities
CVE-2023-24534: Excessive memory allocation in net/http and net/textproto
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-04-06 · updated 2026-06-17
- Weakness: CWE-400
Description
HTTP and MIME header parsing can allocate large amounts of memory, even when parsing small inputs, potentially leading to a denial of service. Certain unusual patterns of input data can cause the common function used to parse HTTP and MIME headers to allocate substantially more memory than required to hold the parsed headers. An attacker can exploit this behavior to cause an HTTP server to allocate large amounts of memory from a small request, potentially leading to memory exhaustion and a denial of service. With fix, header parsing now correctly allocates only the memory required to hold parsed headers.
Affected products
- Go: before 1.19.8; from 1.20.0 before 1.20.3 — fixed in 1.19.8, 1.20.3
How to fix
Upgrade to a fixed version: Go 1.19.8, 1.20.3. Check the vendor advisory for mitigations.
References
- https://go.dev/cl/481994
- https://go.dev/issue/58975
- https://groups.google.com/g/golang-announce/c/Xdv6JL9ENs8
- https://pkg.go.dev/vuln/GO-2023-1704
- https://security.gentoo.org/glsa/202311-09
- https://security.netapp.com/advisory/ntap-20230526-0007/
- https://go.dev/cl/481994
- https://go.dev/issue/58975
- https://groups.google.com/g/golang-announce/c/Xdv6JL9ENs8
- https://pkg.go.dev/vuln/GO-2023-1704
- https://security.gentoo.org/glsa/202311-09
- https://security.netapp.com/advisory/ntap-20230526-0007/
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