CVE-2022-26981Public exploit

Memory corruption via unchecked multipass opcode writes

Published Mar 13, 2022 · Updated Aug 3, 2024

Buffer overflow in Liblouis 3.21.0 and earlier allows context-dependent attackers to write outside allocated memory via a crafted table. In compilePassOpcode, multiple branches append opcode values to the fixed-size passInstructions array without checking MAXSTRING before each write. A consuming application must process the attacker-supplied translation table; the public reproducer reaches the write through lou_checktable and is terminated by AddressSanitizer.

CVSS severity7.8
High
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Liblouis 3.21.0 and earlier allows context-dependent attackers to write outside allocated memory via a crafted table. In compilePassOpcode, multiple branches append opcode values to the fixed-size passInstructions array without checking MAXSTRING before each write. A consuming application must process the attacker-supplied translation table; the public reproducer reaches the write through lou_checktable and is terminated by AddressSanitizer.

The record

CVE
CVE-2022-26981
Published
Mar 13, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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