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TI-2026-07623 Aliases CVE-2026-8674GHSA-qghr-qhfc-4hxp

Assertion failure in the DNS stub resolver with a long search domain

Priority LOW 24CWE-617Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 8 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-617.

Summary

Initializing the DNS stub resolver from an /etc/resolv.conf file, or a LOCALDOMAIN environment variable, whose search list contains a domain of roughly 200 characters or more in the GNU C Library version 2.26 to 2.44 results in an assertion failure which aborts the process. The resolver truncates the search list when copying it into the fixed-size _res.defdname buffer, then asserts that the copy is consistent with the full configuration. The consistency check compared against the wrong size and did not handle a first entry that does not fit, so a correctly truncated list failed the assertion. Any process that resolves names through the library is affected, including long-running processes that reload /etc/resolv.conf on the next query after it changes. Search domains are commonly written to /etc/resolv.conf from data received over DHCP or from a VPN server, so an attacker on the local network may be able to trigger this without privileges on the target system, subject to validation by the network configuration software.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00315 24th percentileScored 2026-11-07
Fix Partial Red Hat: 4 advisoriesRed Hat: 8 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GNUglibc2.26 – 2.44—No fix listedCNA
  • glibc VendorGNU Affected 2.26 – 2.44 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*——GNU
  • cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:* Versions — — ·GNU

Remediation

Red Hat 4 advisories

  • RHSA-2026:95618 Released 2026-11-05 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux AppStream (v. 9) glibc-devel-2.34-284.el9_8.4, glibc-doc-2.34-284.el9_8.4, glibc-headers-2.34-284.el9_8.4 +2
    • Red Hat Enterprise Linux BaseOS (v. 9) glibc-2.34-284.el9_8.4, glibc-all-langpacks-2.34-284.el9_8.4, glibc-common-2.34-284.el9_8.4 +47
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) glibc-benchtests-2.34-284.el9_8.4, glibc-nss-devel-2.34-284.el9_8.4, glibc-static-2.34-284.el9_8.4 +2
  • RHSA-2026:87400 Released 2026-10-21 · Red Hat rating Important
    Red Hat Cost Management On-Premise container image update
    • Red Hat Cost Management On-Premise 1 registry.redhat.io/costmanagement/costmanagement-ui-rhel10
  • RHSA-2026:84753 Released 2026-10-19 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux AppStream (v. 10) glibc-devel-2.39-145.el10_2, glibc-doc-2.39-145.el10_2, glibc-locale-source-2.39-145.el10_2 +1
    • Red Hat Enterprise Linux BaseOS (v. 10) glibc-2.39-145.el10_2, glibc-all-langpacks-2.39-145.el10_2, glibc-common-2.39-145.el10_2 +47
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) glibc-benchtests-2.39-145.el10_2, glibc-nss-devel-2.39-145.el10_2, glibc-static-2.39-145.el10_2 +2
Show 1 more Red Hat advisories
  • RHSA-2026:69276 Released 2026-09-21 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images compat-libpthread-nonshared-2.43-8.6.hum1@aarch64, compat-libpthread-nonshared-2.43-8.6.hum1@x86_64, glibc-2.43-8.6.hum1@aarch64 +47

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)Affected—
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Red Hat Cost Management On-Premise 1Fixed RHSA-2026:87400
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:84753
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:95618
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:84753
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:95618
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:84753
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:95618
Red Hat Hardened ImagesFixed RHSA-2026:69276
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-8674
  2. 2026-10-03 Alias added: GHSA-qghr-qhfc-4hxp
  3. 2026-10-20 Fix available: RHSA-2026:84753 · Red Hat
  4. 2026-10-20 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
  5. 2026-10-22 Fix available: RHSA-2026:87400 · Red Hat
  6. 2026-10-23 Fix available: Red Hat Cost Management On-Premise 1 · Red Hat
  7. 2026-10-31 Affected versions changed · Red Hat
  8. 2026-11-06 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · Red Hat
  9. 2026-11-06 Fix available: RHSA-2026:95618 · Red Hat
  10. 2026-11-06 Affected versions changed · Red Hat

References

Patch 1

Advisory 1

Other 2

  • TI-2026-19388 telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a "-f root"… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05164 GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the… KEVCVSS 3.1HIGH 8.8
  • TI-2023-04522 Glibc: buffer overflow in ld.so leading to privilege escalation KEVCVSS 3.1HIGH 7.8
  • TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
See all 1272 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences