CVE-2025-15536

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 86% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A weakness has been identified in BYVoid OpenCC up to 1.1.9. This vulnerability affects the function opencc::MaxMatchSegmentation of the file src/MaxMatchSegmentation.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. Patch name: 345c9a50ab07018f1b4439776bad78a0d40778ec. To fix this issue, it is recommended to deploy a patch.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

January 18, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 8, 2026
Patch available. Sources: github_commit, github_pr.
generic

[Bug] Heap-buffer-overflow in opencc::MaxMatchSegmentation::Segment · Issue #997 · BYVoid/OpenCC · GitHub

https://github.com/BYVoid/OpenCC/issues/997
generic

1222/repro at main · oneafter/1222 · GitHub

https://github.com/oneafter/1222/blob/main/repro
github_pr Patch Available

Fix two out-of-bounds read issues when handling truncated UTF-8 input

Patch available: BYVoid/OpenCC ver.1.2.0 (PR #1005 merged 2026-01-13)

https://github.com/BYVoid/OpenCC/pull/1005
github_commit Patch Available

commit 345c9a50ab07 (BYVoid/OpenCC)

Patch available: BYVoid/OpenCC ver.1.2.0 (contains commit 345c9a50ab07)

https://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ec
generic

GitHub - BYVoid/OpenCC: Library for conversion between Traditional and Simplified Chinese · GitHub

https://github.com/BYVoid/OpenCC/

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-opencc (1.1.9+ds1-2ubuntu0.1) @ questing2026-05-21ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
opencc1.1.1+git20200624+ds2-10 ... 1.4.1+ds1-1~exp1 (34 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
opencc1.1.6+ds1-1 ... 1.4.2+ds1-1 (34 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
opencc1.1.9+ds1-11.1.9+ds1-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
opencc1.1.9+ds1-1, 1.1.9+ds1-2, 1.1.9+ds1-3, 1.1.9+ds1-3~exp11.1.9+ds1-4—
npm(1)
PackageVulnerable rangeFixed inDependents
opencc—1.2.0—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 190 total refreshes for this CVE.

  1. 2026-09-20 20:14 UTCEPSS rescore
  2. 2026-09-19 03:00 UTCOSV refresh
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-16 14:06 UTCEPSS rescore
  5. 2026-09-16 05:13 UTCEPSS rescore
  6. 2026-09-15 03:08 UTCEPSS rescore
  7. 2026-09-13 16:45 UTCEPSS rescore
  8. 2026-09-12 14:59 UTCEPSS rescore
  9. 2026-09-11 14:51 UTCEPSS rescore
  10. 2026-09-11 09:35 UTCEPSS rescore
  11. 2026-09-10 09:33 UTCEPSS rescore
  12. 2026-09-08 21:59 UTCEPSS rescore
  13. 2026-09-07 16:00 UTCEPSS rescore
  14. 2026-09-06 13:46 UTCEPSS rescore
  15. 2026-09-04 13:59 UTCEPSS rescore
  16. 2026-09-02 14:10 UTCEPSS rescore
  17. 2026-09-01 13:52 UTCEPSS rescore
  18. 2026-09-01 04:38 UTCEPSS rescore
  19. 2026-08-31 06:25 UTCOSV refresh
  20. 2026-08-30 19:16 UTCEPSS rescore
  21. 2026-08-30 01:21 UTCEPSS rescore
  22. 2026-08-28 21:40 UTCEPSS rescore
  23. 2026-08-27 14:24 UTCEPSS rescore
  24. 2026-08-26 14:45 UTCEPSS rescore
  25. 2026-08-25 13:47 UTCEPSS rescore
Show 75 more
  1. 2026-08-24 14:15 UTCEPSS rescore
  2. 2026-08-23 00:18 UTCEPSS rescore
  3. 2026-08-21 23:48 UTCEPSS rescore
  4. 2026-08-20 22:54 UTCEPSS rescore
  5. 2026-08-19 17:02 UTCEPSS rescore
  6. 2026-08-18 13:47 UTCEPSS rescore
  7. 2026-08-17 13:46 UTCEPSS rescore
  8. 2026-08-16 14:55 UTCEPSS rescore
  9. 2026-08-16 02:13 UTCEPSS rescore
  10. 2026-08-16 02:13 UTCEPSS rescore
  11. 2026-08-15 01:29 UTCEPSS rescore
  12. 2026-08-14 13:48 UTCEG score recompute
  13. 2026-08-14 13:48 UTCVendor advisory
  14. 2026-08-13 21:59 UTCEPSS rescore
  15. 2026-08-12 13:49 UTCEPSS rescore
  16. 2026-08-11 13:41 UTCEPSS rescore
  17. 2026-08-10 23:59 UTCEPSS rescore
  18. 2026-08-09 19:24 UTCEG score recompute
  19. 2026-08-09 19:24 UTCVendor advisory
  20. 2026-08-09 13:45 UTCEPSS rescore
  21. 2026-08-08 00:18 UTCEG score recompute
  22. 2026-08-08 00:18 UTCVendor advisory
  23. 2026-08-07 16:26 UTCEPSS rescore
  24. 2026-08-06 13:45 UTCEPSS rescore
  25. 2026-08-06 05:32 UTCEG score recompute
  26. 2026-08-06 05:32 UTCVendor advisory
  27. 2026-08-05 19:16 UTCEPSS rescore
  28. 2026-08-04 15:09 UTCEPSS rescore
  29. 2026-08-04 10:37 UTCEPSS rescore
  30. 2026-08-03 10:35 UTCEPSS rescore
  31. 2026-08-02 23:05 UTCEG score recompute▲ 0.20
  32. 2026-08-02 23:05 UTCVendor advisory
  33. 2026-08-02 02:25 UTCEPSS rescore
  34. 2026-08-01 04:14 UTCEPSS rescore
  35. 2026-07-30 16:26 UTCEPSS rescore
  36. 2026-07-30 01:29 UTCEPSS rescore
  37. 2026-07-28 15:35 UTCEPSS rescore
  38. 2026-07-27 14:12 UTCEPSS rescore
  39. 2026-07-27 01:39 UTCOSV refresh
  40. 2026-07-26 14:53 UTCEPSS rescore
  41. 2026-07-25 14:17 UTCEPSS rescore
  42. 2026-07-24 14:16 UTCEPSS rescore
  43. 2026-07-23 14:17 UTCEPSS rescore
  44. 2026-07-23 02:49 UTCEG score recompute
  45. 2026-07-22 14:07 UTCEPSS rescore
  46. 2026-07-22 14:07 UTCEPSS rescore
  47. 2026-07-21 15:24 UTCEPSS rescore
  48. 2026-07-19 14:30 UTCEPSS rescore
  49. 2026-07-19 14:30 UTCEPSS rescore
  50. 2026-07-19 02:28 UTCEPSS rescore
  51. 2026-07-19 02:28 UTCEPSS rescore
  52. 2026-07-18 10:03 UTCEPSS rescore
  53. 2026-07-16 17:02 UTCEPSS rescore
  54. 2026-07-16 17:02 UTCEPSS rescore
  55. 2026-07-15 16:57 UTCEPSS rescore
  56. 2026-07-15 16:57 UTCEPSS rescore
  57. 2026-07-15 01:59 UTCEPSS rescore
  58. 2026-07-15 01:59 UTCEPSS rescore
  59. 2026-07-13 22:29 UTCEPSS rescore
  60. 2026-07-13 22:29 UTCEPSS rescore
  61. 2026-07-13 06:12 UTCEPSS rescore
  62. 2026-07-12 05:46 UTCEPSS rescore
  63. 2026-07-12 05:45 UTCEPSS rescore
  64. 2026-07-11 08:26 UTCEPSS rescore
  65. 2026-07-11 08:26 UTCEPSS rescore
  66. 2026-07-09 20:17 UTCOSV refresh
  67. 2026-07-09 19:09 UTCEPSS rescore
  68. 2026-07-08 15:14 UTCEPSS rescore
  69. 2026-07-07 13:45 UTCEPSS rescore
  70. 2026-07-06 16:26 UTCEPSS rescore
  71. 2026-07-06 02:22 UTCEPSS rescore
  72. 2026-07-06 02:22 UTCEPSS rescore
  73. 2026-07-05 02:30 UTCEPSS rescore
  74. 2026-07-04 06:30 UTCEPSS rescore
  75. 2026-07-01 15:06 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-15536?
CVE-2025-15536 is a medium vulnerability published on January 18, 2026. A weakness has been identified in BYVoid OpenCC up to 1.1.9. This vulnerability affects the function opencc::MaxMatchSegmentation of the file src/MaxMatchSegmentation.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been made…
When was CVE-2025-15536 disclosed?
CVE-2025-15536 was first published in the National Vulnerability Database on January 18, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15536 actively exploited?
CVE-2025-15536 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 82.4% of all scored CVEs.
What is the CVSS score of CVE-2025-15536?
CVE-2025-15536 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-15536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15536, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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