7.5

CVE-2026-4046: gnu glibc Reachable Assertion

CVSS: 7.5v3.1HighModified
AliasesSUSE-SU-2026:1498-1SUSE-SU-2026:1501-1SUSE-SU-2026:2465-1
Published 30-03-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-4046 is a high (CVSS 7.5) Reachable Assertion vulnerability in gnu glibc. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.66%
0%100%
Low · +0.28 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 6 · Related 5
RHSA-2026:12740RHSA-2026:20597SUSE-SU-2026:21780-1SUSE-SU-2026:2333-1SUSE-SU-2026:2440-1USN-8611-1

Timeline

  1. 30-03-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application. This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

+0.28 pp

From 0.38% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.66%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (sourceware.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Redhat89 products
  • compat-libpthread-nonshared< 0:2.28-251.el8_10.37
  • glibc< 0:2.28-251.el8_10.37 | < 0:2.39-124.el10_2
  • glibc-all-langpacks< 0:2.28-251.el8_10.37 | < 0:2.39-124.el10_2
  • glibc-all-langpacks-debuginfo< 0:2.28-251.el8_10.37
  • glibc-benchtests< 0:2.28-251.el8_10.37 | < 0:2.39-124.el10_2
Chainguard53 products
  • glibc< 2.43-r6
  • glibc-2.43< 2.43-r6
  • glibc-2.43-abi-reportAll versions (No fix recorded)
  • glibc-2.43-dev< 2.43-r6
  • glibc-2.43-iconv< 2.43-r6
Wolfi53 products
  • glibc< 2.43-r6
  • glibc-2.43< 2.43-r6
  • glibc-2.43-abi-reportAll versions (No fix recorded)
  • glibc-2.43-dev< 2.43-r6
  • glibc-2.43-iconv< 2.43-r6
Ubuntu2 products
  • eglibcAll versions (No fix recorded)
  • glibcAll versions (No fix recorded) | < 2.35-0ubuntu3.14 | < 2.39-0ubuntu8.8 | < 2.43-2ubuntu2.3
Debian1 product
  • glibc< 2.36-9+deb12u14 | < 2.41-12+deb13u3 | < 2.42-15
Gnu1 product
Opensuse1 product
  • glibc&distro=openSUSE Tumbleweed< 2.43-2.1

7 vendors · 200 products · Showing 200 of 351. Use Open JSON for the complete list.

References

27 links
Show all 27 references