Heap-based buffer overflow in GNU libbmicrohttpd
Priority MEDIUM 44CWE-122Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.
Summary
NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00485 42nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| GNU | GNU libbmicrohttpd | v1.0.2 and earlier (The vulnerability remains in the source code up until commit ff13abc on the master branch of the libmicrohttpd Git repository; after the v1.0.2 tag.) | — | No fix listed | CNA |
- GNU libbmicrohttpd VendorGNU Affected v1.0.2 and earlier (The vulnerability remains in the source code up until commit ff13abc on the master branch of the libmicrohttpd Git repository; after the v1.0.2 tag.) Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
Not affected: 1 product
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2025-62689
- 2026-10-03 Alias added: GHSA-f97p-pxx9-4r46
References
More GNU Libmicrohttpd vulnerabilities
- TI-2021-02429 Buffer overflow in libmicrohttpd CVSS 3.1CRITICAL 9.8
- 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-2023-12106 GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper… CVSS 3.1MEDIUM 5.9
- TI-2013-05784 Stack-based buffer overflow in the MHD_digest_auth_check function in libmicrohttpd before… CVSS 2.0MEDIUM 5.1
Sources
- CVE-2025-62689 · CVE Program
- CVE-2025-62689 · NVD
- FIRST EPSS
- GHSA-f97p-pxx9-4r46 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-62689 · Red Hat security data · CC BY 4.0
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