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TI-2026-15108 Aliases CVE-2026-18374GHSA-qg52-8pr2-xj9v

Out-of-bounds write in GNU glibc

Priority LOW 21CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 13 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled. This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00144 3rd percentileScored 2026-11-07
Fix Partial glibc (The GNU C Library): 2.45Red Hat: 7 advisoriesRed Hat: 13 fixed, 2 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
GNUglibcbefore 2.452.45Patch availableCNA
  • glibc VendorGNU Affected before 2.45 Fixed in 2.45 Patch available 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

  • Fix · CNA glibc (The GNU C Library) Fixed in 2.45

Red Hat 7 advisories

  • RHSA-2026:95264 Released 2026-11-04 · Red Hat rating Critical
    Cost Management Metrics Operator Update
    • Cost Management 4 registry.redhat.io/costmanagement/costmanagement-metrics-rhel9-operator
  • 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 4 more Red Hat advisories
  • RHSA-2026:82939 Released 2026-10-14 · Red Hat rating Important
    Red Hat Update Infrastructure 5.3 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
  • RHSA-2026:80798 Released 2026-10-12 · Red Hat rating Moderate
    glibc security update
    • Red Hat Enterprise Linux AppStream (v. 8) compat-libpthread-nonshared-2.28-251.el8_10.48, glibc-utils-2.28-251.el8_10.48
    • Red Hat Enterprise Linux BaseOS (v. 8) glibc-2.28-251.el8_10.48, glibc-all-langpacks-2.28-251.el8_10.48, glibc-common-2.28-251.el8_10.48 +47
    • Red Hat Enterprise Linux CRB (v. 8) glibc-benchtests-2.28-251.el8_10.48, glibc-nss-devel-2.28-251.el8_10.48, glibc-static-2.28-251.el8_10.48 +1
  • RHSA-2026:79281 Released 2026-10-08 · Red Hat rating Moderate
    glibc security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) glibc-devel-2.34-283.el9_8, glibc-doc-2.34-283.el9_8, glibc-headers-2.34-283.el9_8 +2
    • Red Hat Enterprise Linux BaseOS (v. 9) glibc-2.34-283.el9_8, glibc-all-langpacks-2.34-283.el9_8, glibc-common-2.34-283.el9_8 +47
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) glibc-benchtests-2.34-283.el9_8, glibc-nss-devel-2.34-283.el9_8, glibc-static-2.34-283.el9_8 +2
  • RHSA-2026:65339 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images compat-libpthread-nonshared-2.43-8.5.hum1@aarch64, compat-libpthread-nonshared-2.43-8.5.hum1@x86_64, glibc-2.43-8.5.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 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Cost Management 4Fixed RHSA-2026:95264
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. 8)Fixed RHSA-2026:80798
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:79281
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:84753
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:80798
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:79281
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:80798
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:84753
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:79281
Red Hat Hardened ImagesFixed RHSA-2026:65339
Red Hat Update Infrastructure 5Fixed RHSA-2026:82939
Not affected: 3 products
  • Cost Management 4
  • Red Hat Hardened Images
  • Red Hat OpenShift AI (RHOAI)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-18374
  2. 2026-10-03 Alias added: GHSA-qg52-8pr2-xj9v
  3. 2026-10-09 Fix available: RHSA-2026:79281 · Red Hat
  4. 2026-10-09 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
  5. 2026-10-13 Fix available: RHSA-2026:80798 · Red Hat
  6. 2026-10-13 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
  7. 2026-10-16 Fix available: RHSA-2026:82939 · Red Hat
  8. 2026-10-16 Fix available: Red Hat Update Infrastructure 5 · Red Hat
  9. 2026-10-20 Fix available: RHSA-2026:84753 · Red Hat
  10. 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
  11. 2026-10-22 Fix available: RHSA-2026:87400 · Red Hat
  12. 2026-10-23 Fix available: Red Hat Cost Management On-Premise 1 · Red Hat
  13. 2026-11-06 Fix available: Cost Management 4 · Red Hat
  14. 2026-11-06 Fix available: RHSA-2026:95264 · Red Hat
  15. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 1

Other 1

  • 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