Skip to content
Fencer Vulns
high 7.5

CVE-2025-62689 json

NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier.

published 2025-11-10 11 mo ago modified 2026-10-08 32 d ago also EUVD-2025-41746

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

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.

Patch / fix

  • gnu libmicrohttpd 1.0.3
  • libmicrohttpd SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.0.1-160000.3.1
  • libmicrohttpd Linux Micro 6.1 0.9.77-slfo.1.1_2.1
  • libmicrohttpd Linux Micro 6.0 0.9.77-2.1
  • libmicrohttpd SLE Module for Desktop Applications 15 SP7, SLE Module for Desktop Applications 15 SP6, SLE Module for Basesystem 15 SP7 +2 more 0.9.77-150600.3.3.1

suse advisories SUSE-SU-2026:20029-1SUSE-SU-2026:20072-1SUSE-SU-2026:20057-1SUSE-SU-2025:21200-1SUSE-SU-2025:4291-1

  • libmicrohttpd openSUSE Leap 16.0 1.0.1-160000.3.1

opensuse advisories openSUSE-SU-2026:20016-1

  • libmicrohttpd Azure Linux 3.0 0.9.77-4

azure linux advisories AZL-70049

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-62689 updated cvss 5.3

libmicrohttpd: GNU libmicrohttpd null pointer dereference

  • Red Hat Enterprise Linux 6 libmicrohttpd Red Hat Enterprise Linux 7 libmicrohttpd
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 libmicrohttpd Red Hat Enterprise Linux 10 libmicrohttpd
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 8 libmicrohttpd
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
11 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • GNU Project GNU libbmicrohttpd

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.