CVE-2023-39434

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-09-27. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: None knownExposed: 0

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

A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. Processing web content may lead to arbitrary code execution.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
73%
KEV
Not listed

Published

September 27, 2023

Last Modified

May 2, 2025

Advisory Details (8)

Auto-updated Aug 30, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Full Disclosure: APPLE-SA-09-26-2023-7 iOS 17 and iPadOS 17

http://seclists.org/fulldisclosure/2023/Oct/8
generic

Full Disclosure: APPLE-SA-09-26-2023-2 macOS Sonoma 14

http://seclists.org/fulldisclosure/2023/Oct/3
generic🔴 Active Exploitation

About the security content of macOS Sonoma 14 - Apple Support

https://support.apple.com/en-us/HT213940
generic

About the security content of iOS 17 and iPadOS 17 - Apple Support

https://support.apple.com/en-us/HT213938
generic

About the security content of watchOS 10 - Apple Support

https://support.apple.com/en-us/HT213937
generic

WebKitGTK+: Multiple Vulnerabilities (GLSA 202401-33) — Gentoo security

https://security.gentoo.org/glsa/202401-33
generic

oss-security - WebKitGTK and WPE WebKit Security Advisory WSA-2023-0009

http://www.openwall.com/lists/oss-security/2023/09/28/3
generic

Full Disclosure: APPLE-SA-09-26-2023-8 watchOS 10

http://seclists.org/fulldisclosure/2023/Oct/9

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.32.3-1 ... 2.40.4-1 (96 versions)2.40.5-1~deb11u1—
wpewebkit2.32.3-2 ... 2.52.5-1 (90 versions)——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.40.1-1 ... 2.40.5-1~deb11u1 (12 versions)2.40.5-1~deb12u1—
wpewebkit2.38.6-1 ... 2.52.6-1 (54 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.40.5-1—
wpewebkit—2.40.5-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk—2.40.5-1—
wpewebkit—2.40.5-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 29× 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 179 total refreshes for this CVE.

  1. 2026-09-24 14:01 UTCEPSS rescore
  2. 2026-09-24 14:01 UTCEPSS rescore
  3. 2026-09-23 13:46 UTCEPSS rescore
  4. 2026-09-22 22:31 UTCOSV refresh
  5. 2026-09-18 19:25 UTCEPSS rescore
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  7. 2026-09-16 14:06 UTCEPSS rescore
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  21. 2026-09-03 17:29 UTCOSV refresh
  22. 2026-09-02 14:09 UTCEPSS rescore
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  24. 2026-08-30 19:15 UTCEPSS rescore
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  1. 2026-08-28 21:39 UTCEPSS rescore
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  3. 2026-08-26 14:44 UTCEPSS rescore
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  5. 2026-08-25 13:46 UTCEPSS rescore
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  11. 2026-08-18 13:46 UTCEPSS rescore
  12. 2026-08-17 13:45 UTCEPSS rescore
  13. 2026-08-17 06:57 UTCOSV refresh
  14. 2026-08-16 14:54 UTCEPSS rescore
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  26. 2026-08-05 19:15 UTCEPSS rescore
  27. 2026-08-04 15:07 UTCEPSS rescore
  28. 2026-08-03 10:34 UTCEPSS rescore
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  30. 2026-08-02 02:25 UTCEPSS rescore
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  32. 2026-08-02 01:36 UTCOSV refresh
  33. 2026-08-01 04:14 UTCEPSS rescore
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  45. 2026-07-23 14:16 UTCEPSS rescore
  46. 2026-07-23 14:16 UTCEPSS rescore
  47. 2026-07-23 02:25 UTCEG score recompute
  48. 2026-07-22 23:12 UTCEG score recompute
  49. 2026-07-22 14:06 UTCEPSS rescore
  50. 2026-07-21 15:23 UTCEPSS rescore
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  52. 2026-07-20 17:06 UTCEPSS rescore
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  55. 2026-07-18 10:03 UTCEPSS rescore
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  57. 2026-07-16 17:01 UTCEPSS rescore
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  61. 2026-07-15 08:49 UTCOSV refresh
  62. 2026-07-15 01:58 UTCEPSS rescore
  63. 2026-07-13 22:28 UTCEPSS rescore
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  69. 2026-07-11 08:26 UTCEPSS rescore
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  71. 2026-07-09 19:08 UTCEPSS rescore
  72. 2026-07-08 15:13 UTCEPSS rescore
  73. 2026-07-07 13:44 UTCEPSS rescore
  74. 2026-07-06 16:26 UTCEPSS rescore
  75. 2026-07-06 16:26 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-39434?
CVE-2023-39434 is a high vulnerability published on September 27, 2023. A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. Processing web content may lead to arbitrary code execution.
When was CVE-2023-39434 disclosed?
CVE-2023-39434 was first published in the National Vulnerability Database on September 27, 2023, with the most recent update on May 2, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-39434 actively exploited?
CVE-2023-39434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 26.7% of all scored CVEs.
What is the CVSS score of CVE-2023-39434?
CVE-2023-39434 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-39434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39434, 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.

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