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TI-2023-12106 Aliases CVE-2023-27371GHSA-x2hm-ghg4-c67m

GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper…

Priority LOW 29CWE-125Published · Updated

Key facts

Attack vector
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, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data boundary in the postprocessor.c MHD_create_post_processor() method. This allows an attacker to remotely send a malicious HTTP POST packet that includes one or more '\0' bytes in a multipart/form-data boundary field, which - assuming a specific heap layout - will result in an out-of-bounds read and a crash in the find_boundary() function.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01253 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 4 advisoriesRed Hat: 8 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
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:gnu:libmicrohttpd:*:*:*:*:*:*:*:*before 0.9.76VulnerableGNU
  • cpe:2.3:a:gnu:libmicrohttpd:*:*:*:*:*:*:*:* Versions before 0.9.76 Vulnerable ·GNU

Remediation

Red Hat 4 advisories

  • RHSA-2024:1109 Released 2024-03-05 · Red Hat rating Moderate
    libmicrohttpd security update
    • Red Hat CodeReady Linux Builder EUS (v.8.6) libmicrohttpd-devel-1:0.9.59-2.el8_6.1, libmicrohttpd-doc-1:0.9.59-2.el8_6.1
    • Red Hat Enterprise Linux BaseOS EUS (v.8.6) libmicrohttpd-1:0.9.59-2.el8_6.1
  • RHSA-2024:0584 Released 2024-01-30 · Red Hat rating Moderate
    libmicrohttpd security update
    • Red Hat CodeReady Linux Builder EUS (v.8.8) libmicrohttpd-devel-1:0.9.59-2.el8_8.1, libmicrohttpd-doc-1:0.9.59-2.el8_8.1
    • Red Hat Enterprise Linux BaseOS EUS (v.8.8) libmicrohttpd-1:0.9.59-2.el8_8.1
  • RHSA-2023:7090 Released 2023-11-14 · Red Hat rating Moderate
    libmicrohttpd security update
    • Red Hat CodeReady Linux Builder (v. 8) libmicrohttpd-devel-1:0.9.59-3.el8, libmicrohttpd-doc-1:0.9.59-3.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) libmicrohttpd-1:0.9.59-3.el8
Show 1 more Red Hat advisories
  • RHSA-2023:6566 Released 2023-11-07 · Red Hat rating Moderate
    libmicrohttpd security update
    • Red Hat CodeReady Linux Builder (v. 9) libmicrohttpd-devel-1:0.9.72-5.el9, libmicrohttpd-doc-1:0.9.72-5.el9
    • Red Hat Enterprise Linux AppStream (v. 9) libmicrohttpd-1:0.9.72-5.el9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2023:7090
Red Hat CodeReady Linux Builder (v. 9)Fixed RHSA-2023:6566
Red Hat CodeReady Linux Builder EUS (v.8.6)Fixed RHSA-2024:1109
Red Hat CodeReady Linux Builder EUS (v.8.8)Fixed RHSA-2024:0584
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:6566
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2023:7090
Red Hat Enterprise Linux BaseOS EUS (v.8.6)Fixed RHSA-2024:1109
Red Hat Enterprise Linux BaseOS EUS (v.8.8)Fixed RHSA-2024:0584

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-27371
  2. 2026-10-03 Alias added: GHSA-x2hm-ghg4-c67m

References

Exploit 1

Patch 1

Other 2

  • TI-2021-02429 Buffer overflow in libmicrohttpd CVSS 3.1CRITICAL 9.8
  • TI-2025-38881 Heap-based buffer overflow in GNU libbmicrohttpd CVSS 4.0HIGH 8.7
  • TI-2025-37229 NULL pointer dereference in GNU libbmicrohttpd CVSS 4.0HIGH 8.7
  • TI-2013-05783 The MHD_http_unescape function in libmicrohttpd before 0.9.32 might allow remote… CVSS 2.0MEDIUM 6.4
  • TI-2013-05784 Stack-based buffer overflow in the MHD_digest_auth_check function in libmicrohttpd before… CVSS 2.0MEDIUM 5.1

Sources

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