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9.8
CVE-2026-5450PATCHED
gnu · glibc

scanf %mc off-by-one heap buffer overflow

Description

Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.

Affected Products

VendorProductVersions
gnuglibc2.7

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
open sourcegnu libccert_advisory90%

References

  • https://sourceware.org/bugzilla/show_bug.cgi?id=CVE-2026-5450(issue-tracking)
  • https://inbox.sourceware.org/libc-announce/b11f0003-6ec1-4bd6-b9de-9e38a4efeca3@redhat.com/T/#u(mailing-list)

Related News (5 articles)

Tier E
Hacker News17d ago
Glibc CVE-2026-5450 9.8
→ No new info (linked only)
Tier A
Microsoft MSRC54d ago
CVE-2026-5450 scanf %mc off-by-one heap buffer overflow
→ No new info (linked only)
Tier B
BSI Advisories55d ago
[NEU] [UNGEPATCHT] [kritisch] GNU libc: Mehrere Schwachstellen
→ No new info (linked only)
Tier C
VulDB56d ago
CVE-2026-5450 | GNU C Library up to 2.43 malloc Character Match heap-based overflow
→ No new info (linked only)
Tier C
oss-security56d ago
The GNU C Library security advisories update for 2026-04-20
→ No new info (linked only)
CVSS 3.19.8 CRITICAL
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA KEV❌ No
Actively exploited❌ No
Patch available
*
CWECWE-122
PublishedApr 20, 2026
Last enriched56d ago
Trending Score11
Source articles5
Independent5
Info Completeness8/14
Missing: cvss, epss, kev, exploit, iocs, mitre_attack

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
Apr 20, 2026
Discovered by ZDM
Apr 20, 2026
Patch Available
Apr 21, 2026