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CVE-2025-15536

21
FAUCET Score

CVE-2025-15536 is a heap-based buffer overflow vulnerability in BYVoid OpenCC up to version 1.1.9, specifically within the opencc::MaxMatchSegmentation function in src/MaxMatchSegmentation.cpp. This flaw has a CVSS score of 5.5 (Medium) and can lead to high availability impact, requiring local access and low privileges for exploitation. While a public exploit is available, there is no evidence of active exploitation, and it currently lacks significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.1.9CPE matchmatch criteria
cpe:2.3:a:byvoid:open_chinese_convert:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

1.9LOW

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
LOW
VS Integrity
LOW
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
PROOF_OF_CONCEPT
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.23%
Probability of exploitation in next 30 days
EPSS Percentile
14.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0023 is in the 61st percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: openccFixed in: 1.2.0
ubuntupatch availablevia ubuntu_usn
Product: opencc (bionic)Fixed in: 1.0.4-5ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: opencc (focal)Fixed in: 1.0.5+git20190530-1ubuntu0.1~esm1
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: opencc

Vendor Advisories (3)

ubuntuUSN-7972-2

OpenCC vulnerability

May 26, 2026
npmGHSA-5pr6-crvp-2j9flow

Open Chinese Convert has Out-of-bounds Write

Jan 18, 2026
redhatCVE-2025-15536Moderate

opencc: OpenCC: Heap-based buffer overflow in MaxMatchSegmentation function allows local attackers to impact system integrity.

Jan 18, 2026

References

github.com / BYVoid/OpenCC
github.com / BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ec
Patch
github.com / BYVoid/OpenCC/issues/997
ExploitIssue TrackingPatch
github.com / BYVoid/OpenCC/pull/1005
Issue TrackingPatch
github.com / oneafter/1222/blob/main/repro
Product
vuldb.com
Permissions RequiredVDB Entry
vuldb.com
Third Party AdvisoryVDB Entry
vuldb.com
ExploitThird Party AdvisoryVDB Entry