chore(deps): document ttf-parser migration decision (RUSTSEC-2026-0192)#900
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ttf-parser is flagged unmaintained (RUSTSEC-2026-0192, informational). This records the evidence-based decision to keep waiting rather than migrate now, and corrects the suppression's inaccurate "cmap only" justification. Findings: - ttf-parser is a DIRECT dependency (~29 call sites: cmap, glyph outlines, metrics, name records — core font parsing + the render outline path), not transitive-only. - It also reaches the tree via fontdb (system-fonts) and via imageproc -> ab_glyph -> owned_ttf_parser (ml). No upgrade of fontdb 0.23, ab_glyph 0.2.32, or imageproc 0.27 removes it — none has a fontations (skrifa/read-fonts) backend. - Fully clearing the advisory therefore requires porting our direct usage to skrifa AND replacing fontdb + ab_glyph with fontations-based crates — a large, multi-crate migration with real regression risk, disproportionate while the advisory is informational-only. Extend the review horizon and re-evaluate when fontdb/ab_glyph ship a fontations backend, or when the standalone font-stack migration is scheduled. Refs #852 Claude-Session: https://claude.ai/code/session_01QXMiKnxkmFs3tCQNz1vMc5
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The ttf-parser/skrifa dep-swap left 3 spaces before the subsetter comment; taplo's TOML format check requires a single space. No dependency change. Claude-Session: https://claude.ai/code/session_01VfT1dvLWaMNh4SpaXV8kcp
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Addresses #852 via its sanctioned "documented decision to keep waiting" acceptance path.
Why not migrate now
ttf-parser(RUSTSEC-2026-0192, informational/unmaintained) cannot be removed by a dependency bump. It reaches the tree three independent ways:truetype_parser,truetype_cmap,font_dict,text_rasterizer: embedded-font cmap, glyph outlines, metrics, and name records (core font parsing + the render outline path). (The issue's "transitive-only, cmap-only" framing was inaccurate — corrected here.)Verified against crates.io/docs/rustsec: no combination of upgraded fontdb/ab_glyph/imageproc removes ttf-parser. Fully clearing the advisory requires porting our direct usage to
skrifaand replacing fontdb + ab_glyph with fontations-based crates — a large, multi-crate migration touching core font-parsing and render paths, with real regression risk that is disproportionate while the advisory is informational-only (no CVE, no memory-safety/RCE implication).The fontations successor (
skrifa/read-fonts) is already in our tree (viasubsetter, and viaharfrustonce #851 lands), so the eventual migration has a foothold.Change (docs-only, no code)
osv-scanner.tomlRUSTSEC-2026-0192 justification to reflect the real (three-path) situation and the explicit decision; extendedignoreUntilto 2026-12-31.ttf-parsercomment inCargo.tomland pointed it at the rationale.Acceptance (#852)
Related: #851 (rustybuzz → harfrust) is the companion shaping migration.
https://claude.ai/code/session_01QXMiKnxkmFs3tCQNz1vMc5