EUVD-2025-18858Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
Local attack, low complexity, low privileges, no user interaction, only availability impact.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
7DescriptionCVE.org
A vulnerability was found in sparklemotion nokogiri c29c920907366cb74af13b4dc2230e9c9e23b833. It has been classified as problematic. This affects the function hashmap_get_with_hash of the file gumbo-parser/src/hashmap.c. The manipulation leads to heap-based buffer overflow. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is named ada4708e5a67114402cd3feb70a4e1d1d7cf773a. It is recommended to apply a patch to fix this issue. The project maintainer explains that the affected code was merged into the main branch but the commit never appeared in an official release.
AnalysisAI
Heap-based buffer overflow in Nokogiri's gumbo HTML5 parser allows local attackers to cause a denial of service via crafted HTML with long duplicate attributes. The vulnerability affects versions 1.18.0 through 1.18.7 and is fixed in commit ada4708e5a67114402cd3feb70a4e1d1d7cf773a, though no official release includes the patch. Public exploit code exists, but active exploitation is not confirmed (not in CISA KEV). EPSS score is low (0.02%), indicating low exploitation likelihood.
Technical ContextAI
The vulnerability resides in the gumbo-parser library used by Nokogiri for HTML5 parsing. The function hashmap_get_with_hash in gumbo-parser/src/hashmap.c mishandles pointer dereferencing when comparing string keys, leading to a heap-based buffer overflow (CWE-119). The root cause is incorrect use of strcmp with direct pointers instead of double indirection, as shown in the patch diff. The affected code was introduced in a development branch and never part of an official release, but it exists in the main branch and is used in Nokogiri versions 1.18.0-1.18.7.
RemediationAI
Apply the patch commit ada4708e5a67114402cd3feb70a4e1d1d7cf773a to the source code, or wait for an official release that includes the fix. As a workaround, avoid parsing untrusted HTML5 content with Nokogiri versions 1.18.0-1.18.7. If possible, downgrade to an earlier unaffected version or use an alternative parser. The patch is available at https://github.com/sparklemotion/nokogiri/commit/ada4708e5a67114402cd3feb70a4e1d1d7cf773a.
Same weakness CWE-119 – Buffer Overflow
View allSame technique Buffer Overflow
View allVendor StatusVendor
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| bionic | not-affected | code not present |
| focal | not-affected | code not present |
| jammy | not-affected | code not present |
| noble | not-affected | code not present |
| oracular | not-affected | code not present |
| plucky | not-affected | code not present |
| trusty | not-affected | vulnerable code never released |
| upstream | not-affected | code not present |
| xenial | not-affected | code not present |
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | fixed | 1.11.1+dfsg-2 | - |
| bullseye (security) | fixed | 1.11.1+dfsg-2+deb11u1 | - |
| bookworm | fixed | 1.13.10+dfsg-2 | - |
| trixie | fixed | 1.18.2+dfsg-1 | - |
| forky | fixed | 1.18.10+dfsg-3 | - |
| sid | fixed | 1.19.1+dfsg-1 | - |
| (unstable) | not-affected | - | - |
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External POC / Exploit Code
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