Medium

Out-of-bounds read in Apple Xcode otool

IdentifiersCVE-2026-28890CWE-125· Out-of-bounds Read

CVE-2026-28890 is an out-of-bounds read vulnerability in otool, a component shipped with Apple Xcode. According to Apple's advisory for Xcode 26.4, the issue affects systems running macOS Tahoe 26.2 and later and was remediated through improved bounds checking. Apple states that a malicious app may be able to trigger the flaw and cause unexpected system termination. No additional technical detail about the specific vulnerable function, parsing path, or input structure was provided in the available content.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation may allow a malicious app to trigger unexpected system termination, resulting in a denial-of-service condition. Based on the available information, the documented impact is limited to system instability or crash behavior; there is no provided evidence of code execution, privilege escalation, or data disclosure beyond the out-of-bounds read condition itself.

Mitigation

If you can’t patch tonight, do this now.

Apply the vendor update as the primary mitigation. Until patching is completed, reduce exposure by limiting execution of untrusted or potentially malicious apps on affected macOS systems and restricting access to developer tooling environments where otool is present. No vendor-provided workaround beyond updating was included in the available content.

Remediation

Patch, then assume compromise.

Upgrade to Xcode 26.4, which fixes CVE-2026-28890 in otool. Apple states the issue was addressed with improved bounds checking. Verify that the installed version is Xcode 26.4 or later.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

AppleXcodeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

2 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-28890

NVD

nvd.nist.gov/vuln/detail/CVE-2026-28890

MITRE CWE · CWE-125

Out-of-bounds Read

Vendor Advisory

support.apple.com/en-us/126801