CVE-2026-81881: radare2 Out-of-bounds Read

Description

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has been demonstrated. This issue is fixed in version 6.2.0.

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CVSS v3.1 Score

3.3

LOW

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

CWE-191 CWE-191

Affected Products

Vendor	Product	Versions
radare	radare2	< 6.2.0

References

Advisories & Patches

https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74 https://github.com/radareorg/radare2/issues/26229 https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9

Exploits

https://github.com/radareorg/radare2/issues/26229

Other References

https://github.com/radareorg/radare2/releases/tag/6.2.0

Frequently Asked Questions

What is CVE-2026-81881? +

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has been demonstrated. This issue is fixed in version 6.2.0. It has a CVSS v3.1 base score of 3.3 (LOW).

How severe is CVE-2026-81881? +

CVE-2026-81881 has a CVSS v3.1 score of 3.3 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-81881? +

CVE-2026-81881 affects products from radare, specifically: radare2. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-81881? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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