CVE-2025-8058

Memory corruption via bracket-parser double-free

Published Jul 23, 2025 · Updated Nov 4, 2025

Double-free in glibc 2.4 through 2.41 allows local users to manipulate memory via crafted regular expressions and allocation failure. The parse_bracket_exp function frees a charset before checking a failed work_tree allocation, and error cleanup then frees that charset again. Triggering the flaw requires heap exhaustion at that allocation or an interposed allocator that injects the failure; the resulting corruption affects the calling process.

CVSS severity5.9
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in glibc 2.4 through 2.41 allows local users to manipulate memory via crafted regular expressions and allocation failure. The parse_bracket_exp function frees a charset before checking a failed work_tree allocation, and error cleanup then frees that charset again. Triggering the flaw requires heap exhaustion at that allocation or an interposed allocator that injects the failure; the resulting corruption affects the calling process.

The record

CVE
CVE-2025-8058
Published
Jul 23, 2025
Updated
Nov 4, 2025
Vendor
The GnuPG Project
Product
glibc
Classifications
CWE-415
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4 <2.42

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The GnuPG Project · glibcversion=2.4 <2.42

Published CVSS scores

5.9GNU C LibraryCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:H/SC:L/SI:L/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free

Public exploit references

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Technologies

Your stack

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Your stack

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