Excessive CPU consumption in Reader.ReadResponse in net/textproto

GO-2025-4015 · BIT-golang-2025-61724 · CVE-2025-61724

Published Oct 29, 2025 · Modified May 15, 2026

Description

The Reader.ReadResponse function constructs a response string through repeated string concatenation of lines. When the number of lines in a response is large, this can cause excessive CPU consumption.

References

FIX https://go.dev/cl/709859
REPORT https://go.dev/issue/75716
WEB https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI

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