# CVE-2026-114731: CVE-2026-114731

Status: published. Published: 2026-10-22. Updated: 2026-11-02.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an uncontrolled resource consumption vulnerability in the CSS proxy (the utils/modcss action). The fetched stylesheet was read into memory in full, with no size limit and no read timeout, so a stylesheet URL referencing an attacker-controlled host could be used to exhaust server memory. Upstream fixed this in the commit “Add a size limit to the CSS proxy content processing”, which caps the response at 5 MB, reads it as a stream and applies a read timeout.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: mitre) — https://github.com/roundcube/roundcubemail/commit/2c9f6da692fa37cad2aaf85d5b127b583d22b264
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: mitre) — https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: mitre) — https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: mitre) — https://github.com/roundcube/roundcubemail/commit/99a5bdd05b01f45493cc0da4c96968eac7668126

## Affected products and versions

- Roundcube / Webmail: ≥ 1.6.0; < 1.6.20 (affected, semver); ≥ 1.7.0; < 1.7.5 (affected, semver). Source: CNA: mitre

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L; source: CNA: mitre

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L; source: NVD: cve@mitre.org

- CISA KEV: No listing in collected sources

- EPSS: 0.43% as of 2026-11-02; percentile 37.49%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://bugs.debian.org/1151279 (CNA: mitre; issue-tracking, third-party-advisory)

- https://github.com/roundcube/roundcubemail/commit/2c9f6da692fa37cad2aaf85d5b127b583d22b264 (CNA: mitre; patch)

- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 (CNA: mitre; vendor-advisory, release-notes)

- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 (CNA: mitre; release-notes, patch)

- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 (CNA: mitre; release-notes, patch)

- https://github.com/roundcube/roundcubemail/commit/99a5bdd05b01f45493cc0da4c96968eac7668126 (CNA: mitre; patch)

- https://bugs.debian.org/1151279 (cve@mitre.org)

- https://github.com/roundcube/roundcubemail/commit/2c9f6da692fa37cad2aaf85d5b127b583d22b264 (cve@mitre.org)

- https://github.com/roundcube/roundcubemail/commit/99a5bdd05b01f45493cc0da4c96968eac7668126 (cve@mitre.org)

- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 (cve@mitre.org)

- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 (cve@mitre.org)

- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 (cve@mitre.org)

## Provenance

- CNA: mitre: https://www.cve.org/CVERecord?id=CVE-2026-114731; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-114731; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-114731; retrieved 2026-11-02; source updated Not reported

Revision: 8e4ff218cbd1208973583599832b95513521ad5746bed7434a7d83c5e1cdfef2

Canonical: https://y2.dev/cve/CVE-2026-114731

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.