CVE-2026-13601

MEDIUMNVD 6.57.1▲
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. NVD baseline CVSS 6.5; sources differ by 0.6.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information.

CVSS v3
6.5
EG Score
7.1(high)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
2.2%
KEV
Not listed

Published

June 29, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jun 29, 2026
Patch available. Sources: redhat.
generic

Flatpak applications are able to exfiltrate host files due to yelp's CSP being too permissive (#238) · Issues · GNOME / yelp · GitLab

https://gitlab.gnome.org/GNOME/yelp/-/work_items/238
generic

Client Challenge

https://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639
redhat

2494110 – (CVE-2026-13601) CVE-2026-13601 yelp: yelp-xsl: Overly Permissive Content Security Policy in Yelp Allows Host File Disclosure from Flatpak Applications

https://bugzilla.redhat.com/show_bug.cgi?id=2494110
generic

Flatpak Sandbox Escape via Yelp – Michael Catanzaro's Blog

https://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-13601

Vendor Advisories for CVE-2026-13601(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 69× 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. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 03:05 UTCEG score recompute
  3. 2026-07-22 14:08 UTCEPSS rescore
  4. 2026-07-21 15:24 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:30 UTCEPSS rescore
  7. 2026-07-19 02:28 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-17 01:43 UTCGHSA enrichment
  10. 2026-07-16 17:02 UTCEPSS rescore
  11. 2026-07-16 14:34 UTCGHSA enrichment
  12. 2026-07-16 03:27 UTCGHSA enrichment
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 16:20 UTCGHSA enrichment
  15. 2026-07-15 05:13 UTCGHSA enrichment
  16. 2026-07-15 02:26 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-14 18:03 UTCGHSA enrichment
  19. 2026-07-14 06:39 UTCGHSA enrichment
  20. 2026-07-13 22:30 UTCEPSS rescore
  21. 2026-07-13 19:29 UTCGHSA enrichment
  22. 2026-07-13 08:22 UTCGHSA enrichment
  23. 2026-07-13 06:12 UTCEPSS rescore
  24. 2026-07-12 21:15 UTCGHSA enrichment
  25. 2026-07-12 10:08 UTCGHSA enrichment
Show 44 more
  1. 2026-07-11 23:01 UTCGHSA enrichment
  2. 2026-07-11 11:54 UTCGHSA enrichment
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 00:47 UTCGHSA enrichment
  5. 2026-07-10 13:40 UTCGHSA enrichment
  6. 2026-07-10 02:32 UTCGHSA enrichment
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 15:24 UTCGHSA enrichment
  9. 2026-07-09 04:16 UTCGHSA enrichment
  10. 2026-07-08 17:02 UTCGHSA enrichment
  11. 2026-07-08 15:15 UTCEPSS rescore
  12. 2026-07-08 15:15 UTCEPSS rescore
  13. 2026-07-08 12:47 UTCMITRE cvelistV5CVSS v3 → 7.1 · severity → HIGH
  14. 2026-07-08 05:54 UTCGHSA enrichment
  15. 2026-07-08 04:32 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  16. 2026-07-07 18:35 UTCGHSA enrichment
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 07:27 UTCGHSA enrichment
  19. 2026-07-06 20:09 UTCGHSA enrichment
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 09:00 UTCGHSA enrichment
  22. 2026-07-06 02:23 UTCEPSS rescore
  23. 2026-07-05 21:54 UTCGHSA enrichment
  24. 2026-07-05 10:47 UTCGHSA enrichment
  25. 2026-07-05 02:30 UTCEPSS rescore
  26. 2026-07-05 02:30 UTCEPSS rescore
  27. 2026-07-04 23:39 UTCGHSA enrichment
  28. 2026-07-04 12:32 UTCGHSA enrichment
  29. 2026-07-04 06:31 UTCEPSS rescore
  30. 2026-07-04 01:25 UTCGHSA enrichment
  31. 2026-07-03 14:18 UTCGHSA enrichment
  32. 2026-07-03 03:11 UTCGHSA enrichment
  33. 2026-07-02 16:05 UTCGHSA enrichment
  34. 2026-07-02 04:57 UTCGHSA enrichment
  35. 2026-07-01 17:51 UTCGHSA enrichment
  36. 2026-07-01 15:06 UTCEPSS rescore
  37. 2026-07-01 15:06 UTCEPSS rescore
  38. 2026-07-01 06:44 UTCGHSA enrichment
  39. 2026-06-30 23:22 UTCEPSS rescore
  40. 2026-06-30 19:37 UTCGHSA enrichment
  41. 2026-06-30 08:31 UTCGHSA enrichment
  42. 2026-06-29 21:25 UTCGHSA enrichment
  43. 2026-06-29 10:18 UTCEG score recompute
  44. 2026-06-29 10:17 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13601?
CVE-2026-13601 is a medium vulnerability published on June 29, 2026. A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document,…
When was CVE-2026-13601 disclosed?
CVE-2026-13601 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13601 actively exploited?
CVE-2026-13601 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13601?
CVE-2026-13601 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.1.
How do I remediate CVE-2026-13601?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13601, 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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