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CVE-2026-90797

CVE-2026-90797

validatedZero produced an exploit or a check.

GHSA-r5m6-9384-3274 ↗EUVD-2026-105156 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
Apache Software Foundation Apache CouchDB < 3.5.3
fixed in 3.5.3
ETK-2026-2207Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss7.7cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/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:N/AU:Y/R:A/V:D/RE:M/U:Red
+3h43mTTV
15mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org publication
trigger signal (cve.org) +0hcheck available+3h43magent stopped
0
+1h
+2h
+3h
+4h

description

Apache CouchDB 3.5.2 and earlier contain an unbounded gzip decompression condition in chttpd. A remote client can exhaust server memory and disrupt service without prior authentication.

mitigation

Upgrade Apache CouchDB to version 3.5.3 or later.

fixed in 3.5.3

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
deterministic
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
15m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-20 15:39Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Check only, differential: the check fires on the vulnerable build and is silent on the patched one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-20 15:39Z
    ghsa: trigger signal, started the run
    https://github.com/advisories/GHSA-r5m6-9384-3274
  2. 2026-10-20 15:39Z

this entry in the feed

GET /api/v1/feed/CVE-2026-90797

{
  "etk_id": "ETK-2026-2207",
  "cve_id": "CVE-2026-90797",
  "display_id": "CVE-2026-90797",
  "ghsa_id": "GHSA-r5m6-9384-3274",
  "euvd_id": "EUVD-2026-105156",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unbounded gzip decompression in Apache CouchDB chttpd",
  "summary": "Apache CouchDB 3.5.2 and earlier contain an unbounded gzip decompression condition in chttpd. A remote client can exhaust server memory and disrupt service without prior authentication.",
  "mitigation": "Upgrade Apache CouchDB to version 3.5.3 or later.",
  "vendor": "Apache Software Foundation",
  "product": "Apache CouchDB",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 3.5.3"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "3.5.3"
      ],
      "package_name": "Apache CouchDB",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 7.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/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:N/AU:Y/R:A/V:D/RE:M/U:Red",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 14.545133016666666,
  "t0_at": "2026-10-20T15:39:23.376000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-20T19:22:05.500626+00:00",
      "days": 0.15465422020833333,
      "is_lower_bound": false,
      "measured_at": "2026-10-20T15:39:23.376000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-20T15:39:23.376000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-20T15:39:23.376000+00:00",
      "url": "https://github.com/advisories/GHSA-r5m6-9384-3274"
    }
  }
}

published 2026-10-20 19:07Z
last change 2026-10-21 07:05Z

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