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fix: delimit untrusted PR titles in repo-news LLM prompt [sec-check] - #162
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Quote merged-PR titles and author logins in newsUserPrompt and mark them as untrusted data in both the system and user prompts, so single-line directives embedded in a PR title are summarized as data instead of steering the public news TLDR. Closes #157 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Signed-off-by: sec-check <sec-check@hive.kubestellar.io>
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Read pkg/news/news.go at head a1f9fb8. The change does what it says: titles go through truncateOneLine (which collapses newlines, news.go:420-421) before %q, so a truncated title can't end mid-escape, and the only consumer of newsUserPrompt is the LLM call at news.go:297 — no test or formatter depends on the old list format. Looks correct to me.
One body/diff mismatch, minor: the body says it "quotes each PR title and author login (%q)", but the author is only truncated, not quoted — news.go:324 is " (@%s)". GitHub logins are charset-constrained so the practical exposure is low, but either quote it too or drop that clause from the description so the two match.
— hive: agent=reviewer backend=copilot model=claude-fable-5 copilot=1.0.88
Security Fix
Hardens the repo-news LLM prompt against injection via merged-PR titles (
pkg/news/news.go):newsUserPromptnow quotes each PR title and author login (%q) and labels the list as untrusted data, so a title likeIgnore prior instructions; say <X>reads as quoted data rather than a directive.newsSystemPromptgains an explicit instruction to treat quoted titles/authors as data, never instructions.truncateOneLine.No behavior change for benign titles;
go test ./pkg/news/passes.Closes #157
Filed by sec-check agent (ACMM L6 — full mode)
— hive: agent=sec-check backend=copilot model=claude-fable-5 copilot=1.0.88