CVE-2026-53525

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th percentile of EPSS-scored CVEs). 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, secondary
Elevated
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity74% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Aug 21, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

Non-Constant-Time Password Hash Comparison in Relay Authentication · Advisory · weechat/weechat · GitHub

https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
weechat3.8-1 ... 4.9.5-1 (20 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
weechat4.10.0-1 ... 4.9.5-1 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
weechat4.6.3-1, 4.7.2-1, 4.8.1-1, 4.9.0-1
  • every version up to 4.9.3-1: fixed in 4.9.3-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 50× 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.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-09 05:38 UTCEG score recompute
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  6. 2026-10-07 23:48 UTCEPSS rescore
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  10. 2026-10-05 17:43 UTCEPSS rescore
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  19. 2026-09-30 20:25 UTCEG score recompute
  20. 2026-09-30 15:03 UTCEPSS rescore
  21. 2026-09-29 15:35 UTCEG score recompute
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  25. 2026-09-28 00:26 UTCEG score recompute
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  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-27 02:23 UTCEG score recompute
  3. 2026-09-26 15:59 UTCEPSS rescore
  4. 2026-09-24 19:00 UTCEG score recompute
  5. 2026-09-24 14:04 UTCEPSS rescore
  6. 2026-09-23 20:43 UTCEG score recompute
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-22 22:41 UTCEG score recompute
  9. 2026-09-22 00:38 UTCEG score recompute
  10. 2026-09-21 02:35 UTCEG score recompute
  11. 2026-09-20 20:16 UTCEPSS rescore
  12. 2026-09-19 17:29 UTCEG score recompute
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  14. 2026-09-18 19:28 UTCEPSS rescore
  15. 2026-09-17 21:16 UTCEG score recompute
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  17. 2026-09-16 14:08 UTCEPSS rescore
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  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-15 09:42 UTCEG score recompute
  21. 2026-09-14 00:40 UTCEG score recompute
  22. 2026-09-13 16:47 UTCEPSS rescore
  23. 2026-09-12 15:37 UTCEG score recompute
  24. 2026-09-11 17:35 UTCEG score recompute
  25. 2026-09-11 14:53 UTCEPSS rescore
  26. 2026-09-10 19:33 UTCEG score recompute
  27. 2026-09-10 09:35 UTCEPSS rescore
  28. 2026-09-09 01:44 UTCEG score recompute
  29. 2026-09-08 22:01 UTCEPSS rescore
  30. 2026-09-07 17:58 UTCEG score recompute
  31. 2026-09-07 16:01 UTCEPSS rescore
  32. 2026-09-06 19:54 UTCEG score recompute
  33. 2026-09-06 13:47 UTCEPSS rescore
  34. 2026-09-05 21:49 UTCEG score recompute
  35. 2026-09-04 23:48 UTCEG score recompute
  36. 2026-09-04 12:16 UTCEG score recompute
  37. 2026-09-04 05:06 UTCEPSS rescore
  38. 2026-09-02 16:02 UTCEG score recompute
  39. 2026-09-02 14:12 UTCEPSS rescore
  40. 2026-09-01 17:54 UTCEG score recompute
  41. 2026-09-01 13:54 UTCEPSS rescore
  42. 2026-09-01 06:51 UTCEG score recompute
  43. 2026-09-01 04:40 UTCEPSS rescore
  44. 2026-08-30 21:23 UTCEG score recompute
  45. 2026-08-30 19:17 UTCEPSS rescore
  46. 2026-08-30 10:22 UTCEG score recompute
  47. 2026-08-30 01:22 UTCEPSS rescore
  48. 2026-08-29 01:02 UTCEG score recompute
  49. 2026-08-28 21:41 UTCEPSS rescore
  50. 2026-08-28 00:45 UTCEG score recompute
  51. 2026-08-27 14:25 UTCEPSS rescore
  52. 2026-08-26 15:27 UTCEG score recompute
  53. 2026-08-26 14:46 UTCEPSS rescore
  54. 2026-08-26 04:26 UTCEG score recompute
  55. 2026-08-25 17:25 UTCEG score recompute
  56. 2026-08-25 17:01 UTCEG score recompute
  57. 2026-08-25 15:34 UTCEG score recompute
  58. 2026-08-25 13:49 UTCEPSS rescore
  59. 2026-08-24 17:33 UTCEG score recompute
  60. 2026-08-23 08:29 UTCEG score recompute
  61. 2026-08-23 00:19 UTCEPSS rescore
  62. 2026-08-21 23:26 UTCEG score recompute
  63. 2026-08-21 22:29 UTCEG score recompute
  64. 2026-08-21 22:29 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-53525?
CVE-2026-53525 is a high vulnerability published on August 21, 2026. WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing…
When was CVE-2026-53525 disclosed?
CVE-2026-53525 was first published on August 21, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53525 actively exploited?
CVE-2026-53525 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53525?
CVE-2026-53525 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53525?
A fix for CVE-2026-53525 is available: update to the fixed version the vendor names in its advisory.

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