TI-2025-05895 Aliases CVE-2025-6494

sparklemotion nokogiri hashmap.c hashmap_get_with_hash heap-based overflow

MEDIUM 55CWE-119Published 2025-06-22 · Updated 2025-06-30

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00185 8th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
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

Vendor	Product	Affected versions	Fixed in	Status	Source
sparklemotion	nokogiri	c29c920907366cb74af13b4dc2230e9c9e23b833	—	No fix listed	CNA

nokogiri Vendorsparklemotion Affected c29c920907366cb74af13b4dc2230e9c9e23b833 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:nokogiri:nokogiri::::::::	—	—	sparklemotion

cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:*:*:* Versions — — ·sparklemotion

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-6494

References

Exploit 1

https://github.com/user-attachments/files/19825279/nokogiri_crash_2.txt

Patch 1

https://github.com/sparklemotion/nokogiri/commit/ada4708e5a67114402cd3feb70a4e1d1d7cf773a

Other 2

TI-2022-11724 Improper Handling of Unexpected Data Type in Nokogiri CVSS 3.1HIGH 8.2
TI-2018-15259 zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if… CVSS 3.1HIGH 7.5
TI-2026-69678 Mechanize leaks credential headers to other hosts after redirects CVSS 3.1MEDIUM 6.8
TI-2025-05891 sparklemotion nokogiri hashmap.c hashmap_set_with_hash heap-based overflow CVSS 4.0MEDIUM 4.8
TI-2019-03885 OS command injection in Nokogiri CVSS 3.1CRITICAL 9.8
TI-2026-55247 Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer CVSS 4.0HIGH 8.7

See all 31 →

Sources

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