RHSA-2026:56340

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label.

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.

Prometheus is an open-source monitoring system and time series database.

Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

A norm.Iter can enter an infinite loop when handling input containing invalid UTF-8 bytes.

Prometheus is an open-source monitoring system and time series database.

Parsing a WEBP image with an invalid, large size panics on 32-bit platforms.

Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service.

On Linux, if the target of Root.Chmod is replaced with a symlink while the chmod operation is in progress, Chmod can operate on the target of the symlink, even when the target lies outside the root.

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree.

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree.

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree.