CVE-2026-13601

HIGHNVD 6.57.1▲
EchelonGraph scoreMEDIUM 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 — Patch released this week
7.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

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(medium)
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 PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

June 29, 2026

Last Modified

August 20, 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(9)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuyelp (3.26.0-1ubuntu2+esm1) @ bionic2026-08-21ubuntu
redhatyelp-2:3.28.1-2.el7_92026-08-20redhat
redhatyelp-2:40.3-2.el9_2.22026-08-13redhat
redhatyelp-2:40.3-2.el9_4.22026-08-13redhat
redhatyelp-2:40.3-2.el9_6.22026-08-13redhat
redhatyelp-2:3.28.1-3.el8_8.22026-08-13redhat
redhatyelp-2:3.28.1-3.el8_4.22026-08-13redhat
redhatyelp-2:3.28.1-3.el8_6.22026-08-13redhat
redhatyelp-2:40.3-3.el9_8.12026-08-03redhat
redhatyelp-2:3.28.1-3.el8_10.22026-08-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
yelp3.38.3-1, 3.38.3-1+deb11u13.38.3-1+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
yelp42.2-1, 42.2-1+deb12u142.2-1+deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
yelp42.2-442.2-4+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
yelp42.2-4 ... 49~rc-1 (10 versions)49.1-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 44× in last 7d / 168× 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.

Showing the most recent 100 of 234 total refreshes for this CVE.

  1. 2026-08-21 01:03 UTCEG score recompute
  2. 2026-08-21 01:03 UTCVendor advisory
  3. 2026-08-21 01:03 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 13:57 UTCVendor advisory
  6. 2026-08-20 13:57 UTCGHSA enrichment
  7. 2026-08-20 12:42 UTCVendor advisory
  8. 2026-08-20 12:42 UTCGHSA enrichment
  9. 2026-08-20 10:25 UTCVendor advisory
  10. 2026-08-20 10:25 UTCGHSA enrichment
  11. 2026-08-20 09:42 UTCVendor advisory
  12. 2026-08-20 09:42 UTCGHSA enrichment
  13. 2026-08-20 05:52 UTCEG score recompute
  14. 2026-08-20 05:52 UTCVendor advisory
  15. 2026-08-20 05:52 UTCGHSA enrichment
  16. 2026-08-19 17:03 UTCEPSS rescore
  17. 2026-08-19 10:28 UTCVendor advisory
  18. 2026-08-19 10:28 UTCGHSA enrichment
  19. 2026-08-18 23:21 UTCEG score recompute
  20. 2026-08-18 23:21 UTCVendor advisory
  21. 2026-08-18 23:21 UTCGHSA enrichment
  22. 2026-08-18 13:48 UTCEPSS rescore
  23. 2026-08-17 08:07 UTCVendor advisory
  24. 2026-08-17 08:07 UTCGHSA enrichment
  25. 2026-08-16 21:00 UTCEG score recompute
Show 75 more
  1. 2026-08-16 21:00 UTCVendor advisory
  2. 2026-08-16 21:00 UTCGHSA enrichment
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 09:53 UTCEG score recompute
  5. 2026-08-16 09:53 UTCVendor advisory
  6. 2026-08-16 09:53 UTCGHSA enrichment
  7. 2026-08-16 02:14 UTCEPSS rescore
  8. 2026-08-15 22:47 UTCVendor advisory
  9. 2026-08-15 22:47 UTCGHSA enrichment
  10. 2026-08-15 11:40 UTCEG score recompute
  11. 2026-08-15 11:40 UTCVendor advisory
  12. 2026-08-15 11:40 UTCGHSA enrichment
  13. 2026-08-15 01:30 UTCEPSS rescore
  14. 2026-08-15 00:33 UTCVendor advisory
  15. 2026-08-15 00:33 UTCGHSA enrichment
  16. 2026-08-14 13:26 UTCVendor advisory
  17. 2026-08-14 13:26 UTCGHSA enrichment
  18. 2026-08-14 12:29 UTCVendor advisory
  19. 2026-08-14 12:29 UTCGHSA enrichment
  20. 2026-08-14 09:32 UTCVendor advisory
  21. 2026-08-14 09:32 UTCGHSA enrichment
  22. 2026-08-13 22:25 UTCVendor advisory
  23. 2026-08-13 22:25 UTCGHSA enrichment
  24. 2026-08-13 22:09 UTCEG score recompute
  25. 2026-08-13 22:09 UTCVendor advisory
  26. 2026-08-13 22:09 UTCGHSA enrichment
  27. 2026-08-13 22:00 UTCEPSS rescore
  28. 2026-08-13 17:20 UTCVendor advisory
  29. 2026-08-13 17:20 UTCGHSA enrichment
  30. 2026-08-13 17:05 UTCVendor advisory
  31. 2026-08-13 17:05 UTCGHSA enrichment
  32. 2026-08-13 16:38 UTCVendor advisory
  33. 2026-08-13 16:38 UTCGHSA enrichment
  34. 2026-08-13 14:26 UTCVendor advisory
  35. 2026-08-13 14:26 UTCGHSA enrichment
  36. 2026-08-13 13:19 UTCVendor advisory
  37. 2026-08-13 13:19 UTCGHSA enrichment
  38. 2026-08-13 02:47 UTCVendor advisory
  39. 2026-08-13 02:47 UTCGHSA enrichment
  40. 2026-08-12 15:40 UTCEG score recompute
  41. 2026-08-12 15:40 UTCVendor advisory
  42. 2026-08-12 15:40 UTCGHSA enrichment
  43. 2026-08-12 13:50 UTCEPSS rescore
  44. 2026-08-12 04:17 UTCVendor advisory
  45. 2026-08-12 04:17 UTCGHSA enrichment
  46. 2026-08-11 17:10 UTCEG score recompute
  47. 2026-08-11 17:10 UTCVendor advisory
  48. 2026-08-11 17:10 UTCGHSA enrichment
  49. 2026-08-11 13:42 UTCEPSS rescore
  50. 2026-08-11 06:04 UTCEG score recompute
  51. 2026-08-11 06:04 UTCVendor advisory
  52. 2026-08-11 06:04 UTCGHSA enrichment
  53. 2026-08-10 23:59 UTCEPSS rescore
  54. 2026-08-10 18:57 UTCVendor advisory
  55. 2026-08-10 18:57 UTCGHSA enrichment
  56. 2026-08-10 07:49 UTCVendor advisory
  57. 2026-08-10 07:49 UTCGHSA enrichment
  58. 2026-08-09 20:43 UTCEG score recompute
  59. 2026-08-09 20:43 UTCVendor advisory
  60. 2026-08-09 20:43 UTCGHSA enrichment
  61. 2026-08-09 13:46 UTCEPSS rescore
  62. 2026-08-09 09:36 UTCVendor advisory
  63. 2026-08-09 09:36 UTCGHSA enrichment
  64. 2026-08-08 22:30 UTCEG score recompute
  65. 2026-08-08 22:30 UTCVendor advisory
  66. 2026-08-08 22:30 UTCGHSA enrichment
  67. 2026-08-08 16:37 UTCEPSS rescore
  68. 2026-08-08 11:23 UTCVendor advisory
  69. 2026-08-08 11:23 UTCGHSA enrichment
  70. 2026-08-08 00:17 UTCEG score recompute
  71. 2026-08-08 00:17 UTCVendor advisory
  72. 2026-08-08 00:17 UTCGHSA enrichment
  73. 2026-08-07 13:10 UTCVendor advisory
  74. 2026-08-07 13:10 UTCGHSA enrichment
  75. 2026-08-07 02:04 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-13601?
CVE-2026-13601 is a high 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 August 20, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 96.8% of all scored CVEs.
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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