CVE-2026-86035

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (28th 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
Trending — 3 sources updated this week
8.5EG
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: 8.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Weblate is a web-based continuous localization platform used to manage software translations. Weblate 4.11.1 through 2026.7.1 contains an argument-injection vulnerability in its Mercurial backend. Repository filenames beginning with - could be interpreted as Mercurial options instead of literal paths. An authenticated user with project-scoped component.edit permission could exploit this through a Mercurial-backed RESX component using the Update RESX files add-on. A later repository update could execute arbitrary commands with the privileges of the Weblate service account. This is a residual incomplete fix for CVE-2022-23915. This issue has been patched in version 2026.8.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity85% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (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

September 29, 2026

Last Modified

October 2, 2026

Advisory Details (4)

Auto-updated Sep 29, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

Weblate 2026.8

Patch available: WeblateOrg/weblate weblate-2026.8

https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.8
github_commit

commit f60a9759a6d8 (WeblateOrg/weblate)

Fix landed in WeblateOrg/weblate commit f60a9759a6d8 — awaiting tagged release

https://github.com/WeblateOrg/weblate/commit/f60a9759a6d851bd10ccdefe9b1b7f0cdb9e9bbd
github_pr

fix(vcs): terminate Mercurial path options

Fix merged in WeblateOrg/weblate PR #20768 on 2026-07-19 — awaiting tagged release

https://github.com/WeblateOrg/weblate/pull/20768
github Patch Available

Mercurial argument injection via repository filenames allows authenticated command execution · Advisory · WeblateOrg/weblate · GitHub

https://github.com/WeblateOrg/weblate/security/advisories/GHSA-327h-qqgm-qv55

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 12× 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. 2026-10-04 02:45 UTCEG score recompute
  2. 2026-10-03 01:48 UTCEG score recompute
  3. 2026-10-02 17:57 UTCEPSS rescore
  4. 2026-10-02 13:18 UTCEG score recompute
  5. 2026-10-02 12:22 UTCEG score recompute
  6. 2026-10-01 21:02 UTCEG score recompute
  7. 2026-10-01 19:50 UTCEPSS rescore
  8. 2026-09-30 16:34 UTCEG score recompute
  9. 2026-09-30 15:04 UTCEPSS rescore
  10. 2026-09-29 15:23 UTCEG score recompute
  11. 2026-09-29 15:09 UTCEG score recompute
  12. 2026-09-29 15:08 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-86035?
CVE-2026-86035 is a high vulnerability published on September 29, 2026. Weblate is a web-based continuous localization platform used to manage software translations. Weblate 4.11.1 through 2026.7.1 contains an argument-injection vulnerability in its Mercurial backend. Repository filenames beginning with - could be interpreted as Mercurial options instead of literal…
When was CVE-2026-86035 disclosed?
CVE-2026-86035 was first published on September 29, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86035 actively exploited?
CVE-2026-86035 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-86035?
CVE-2026-86035 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-86035?
A fix for CVE-2026-86035 is available: update to the fixed version the vendor names in its advisory.

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