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
7.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

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%
EPSS PROB
0.2%
EPSS %ILE
6th
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/
redhatMentions a patch (unverified)

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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuyelp (3.36.2-0ubuntu1.1+esm1) @ focal2026-09-23ubuntu
redhatyelp-2:3.28.1-2.el7_92026-08-20redhat
redhatyelp-2:3.28.1-3.el8_8.22026-08-13redhat
redhatyelp-2:40.3-2.el9_6.22026-08-13redhat
redhatyelp-2:3.28.1-3.el8_6.22026-08-13redhat
redhatyelp-2:40.3-2.el9_2.22026-08-13redhat
redhatyelp-2:40.3-2.el9_4.22026-08-13redhat
redhatyelp-2:3.28.1-3.el8_4.22026-08-13redhat
redhatyelp-2:3.28.1-3.el8_10.22026-08-03redhat
redhatyelp-2:40.3-3.el9_8.12026-08-03redhat

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 rangeFix by version rangeDependents
yelp3.38.3-1, 3.38.3-1+deb11u1
  • every version up to 3.38.3-1+deb11u2: fixed in 3.38.3-1+deb11u2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
yelp42.2-1, 42.2-1+deb12u1
  • every version up to 42.2-1+deb12u2: fixed in 42.2-1+deb12u2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
yelp42.2-4
  • every version up to 42.2-4+deb13u1: fixed in 42.2-4+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
yelp42.2-4 ... 49~rc-1 (10 versions)
  • every version up to 49.1-1: fixed in 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 7× in last 7d / 36× 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 312 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-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 (HIGH).
How do I remediate CVE-2026-13601?
A fix for CVE-2026-13601 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-13601 are linked in the Vendor Advisories panel on this page.

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