CVE-2026-47121

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-05-29. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 0

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

Sparkle is a software update framework for macOS. Prior to version 2.9.2, Autoupdate/SUBinaryDeltaApply.m enforces relativePath.pathComponents containsObject:@".." and rejects writes whose immediate parent directory IS itself a symbolic link, but does not detect symlinks deeper in the relative path. Autoupdate/SPUSparkleDeltaArchive.m's extractItem: will create symlinks in the destination tree from archive content (no .. check on the symlink target), and a subsequent Extract item targeting /foo/bar then escapes the destination tree via fopen(path, "wb") because the kernel resolves the intermediate symlink during the open call. This is a defense-in-depth issue: exploitation requires a maliciously-crafted .delta that passes EdDSA signature verification, i.e. EdDSA private-key compromise. With the AppInstaller running as root for system-domain installs, it gives the holder of a stolen signing key arbitrary file write at root level via the delta-apply path, which is a strictly broader primitive than the "drop-in replacement bundle" install they would otherwise have. Version 2.9.2 contains a patch for the issue.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
13.8%
KEV
Not listed

Published

May 29, 2026

Last Modified

July 22, 2026

Advisory Details (2)

Auto-updated Jul 21, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Binary delta apply intermediate-symlink traversal in malicious .delta · Advisory · sparkle-project/Sparkle · GitHub

https://github.com/sparkle-project/Sparkle/security/advisories/GHSA-hg88-v3cw-3qrh
github_commit Patch Available

commit fe7b718d0736 (sparkle-project/Sparkle)

Patch available: sparkle-project/Sparkle 2.9.2 (contains commit fe7b718d0736)

https://github.com/sparkle-project/Sparkle/commit/fe7b718d0736f3e139e374e26fbca96f29e13bf0

Vendor Advisories for CVE-2026-47121(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
swiftgithub.com/sparkle-project/Sparkle—ghsa

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.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 2× in last 7d / 14× 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 03:17 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-16 01:49 UTCGHSA enrichment
  4. 2026-07-14 13:55 UTCGHSA enrichment
  5. 2026-07-11 17:23 UTCGHSA enrichment
  6. 2026-07-08 17:17 UTCGHSA enrichment
  7. 2026-07-02 03:48 UTCGHSA enrichment
  8. 2026-07-01 01:28 UTCGHSA enrichment
  9. 2026-06-29 12:30 UTCGHSA enrichment
  10. 2026-06-28 04:14 UTCGHSA enrichment
  11. 2026-06-27 04:11 UTCGHSA enrichment
  12. 2026-06-26 02:48 UTCGHSA enrichment
  13. 2026-06-25 02:50 UTCGHSA enrichment
  14. 2026-06-24 02:51 UTCGHSA enrichment
  15. 2026-06-19 00:20 UTCGHSA enrichment
  16. 2026-06-18 00:13 UTCGHSA enrichment
  17. 2026-06-17 00:12 UTCGHSA enrichment
  18. 2026-06-16 00:13 UTCGHSA enrichment
  19. 2026-06-15 00:15 UTCGHSA enrichment
  20. 2026-06-14 23:18 UTCEPSS rescore
  21. 2026-06-14 00:17 UTCGHSA enrichment
  22. 2026-06-13 23:00 UTCEPSS rescore
  23. 2026-06-13 00:19 UTCGHSA enrichment
  24. 2026-06-12 23:12 UTCEPSS rescore
  25. 2026-06-12 00:17 UTCGHSA enrichment
Show 13 more
  1. 2026-06-11 00:19 UTCGHSA enrichment
  2. 2026-06-10 00:22 UTCGHSA enrichment
  3. 2026-06-09 00:25 UTCGHSA enrichment
  4. 2026-06-08 00:27 UTCGHSA enrichment
  5. 2026-06-07 00:30 UTCGHSA enrichment
  6. 2026-06-06 00:32 UTCGHSA enrichment
  7. 2026-06-05 00:35 UTCGHSA enrichment
  8. 2026-06-04 00:38 UTCGHSA enrichment
  9. 2026-06-03 00:40 UTCGHSA enrichment
  10. 2026-06-02 00:39 UTCGHSA enrichment
  11. 2026-06-01 00:42 UTCGHSA enrichment
  12. 2026-05-29 20:20 UTCEG score recompute
  13. 2026-05-29 20:20 UTCGHSA enrichment

Related CVEs(same product + same CWE)

Same product

1 shown

swift:github.com/sparkle-project/Sparkle

Frequently asked(5)

What is CVE-2026-47121?
CVE-2026-47121 is a medium vulnerability published on May 29, 2026. Sparkle is a software update framework for macOS. Prior to version 2.9.2, Autoupdate/SUBinaryDeltaApply.m enforces relativePath.pathComponents containsObject:@".." and rejects writes whose immediate parent directory IS itself a symbolic link, but does not detect symlinks deeper in the relative…
When was CVE-2026-47121 disclosed?
CVE-2026-47121 was first published in the National Vulnerability Database on May 29, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47121 actively exploited?
CVE-2026-47121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47121?
CVE-2026-47121 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-47121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47121, 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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