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Vulnerability · medium

GNU C Library security advisories for November 2026

Tier C · Keep an eye on it – Check if you’re affected

Who’s exposed: Programs calling wide scanf functions (swscanf, fwscanf, wscanf)

Tier C because: Hits tech teams

Reach

Attack

Damage

Fix

Core infrastructure · Popular tool

What to do

  1. Read the full GLIBC-SA-2026-0027 advisory to confirm affected versions and the fix

The Brief

  • The GNU C Library published security advisory GLIBC-SA-2026-0027 on 2026-11-11, as part of its November 2026 advisories.
  • The advisory describes a one-byte buffer overflow in the scanf %s and %[ conversions for wide characters.
  • Calling the wide scanf family of functions (swscanf, fwscanf, wscanf) is the trigger described in the excerpt available.

Why it matters

Software that calls glibc's wide scanf functions may be affected by a memory-safety bug, so developers should check whether their code uses these functions and whether their glibc version is patched.

The checklist behind the tier

Checklist · 3 of 10 yes
YesHits tech teamsglibc is a core C library that developers, ops and IT teams build with and run.
YesCore infrastructureglibc is core Linux infrastructure used by nearly every system.
YesPopular toolglibc is a foundational library, so this is yes by the core-infrastructure rule.
NoExploited in the wildoss-sec post only announces advisories; it reports no observed attacks.
NoPublic exploitoss-sec post gives only the advisory title and summary; no exploit code is mentioned.
NoRemote, no loginoss-sec excerpt describes a scanf buffer overflow; it does not say it is remote or unauthenticated.
NoFull takeoveross-sec excerpt does not state code execution or privilege escalation.
NoSecrets exposedoss-sec post reports no data theft or exposure of secrets.
NoSupply chainoss-sec post describes a vulnerability advisory, not a compromised package or build.
NoNo fix yetoss-sec post announces published advisories; it does not say a fix is missing.

Timeline

  1. GLIBC-SA-2026-0027 security advisory published

  2. Open Source Security

    The GNU C Library security advisories update for 2026-11-11

Source

The GNU C Library security advisories update for 2026-11-11 ↗ Open Source Security · 2h ago

First seen · 1 source · Full story page · How tiers are decided