CVE-2026-2259Public exploit

Compiler crash via empty parser block dereference

Published Feb 10, 2026 · Updated Feb 10, 2026

Memory corruption in Lobster 2025.0 through 2025.4 allows local users to crash the compiler with a crafted source file. ParseStatements accepts an attribute-only statement that adds no AST node, then calls block->children.back() on the empty vector and performs an invalid read. The user must be able to invoke the local compiler on the file; the demonstrated consequence is a segmentation fault and process abort, not code execution.

CVSS severity3.3
Low
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Lobster 2025.0 through 2025.4 allows local users to crash the compiler with a crafted source file. ParseStatements accepts an attribute-only statement that adds no AST node, then calls block->children.back() on the empty vector and performs an invalid read. The user must be able to invoke the local compiler on the file; the demonstrated consequence is a segmentation fault and process abort, not code execution.

The record

CVE
CVE-2026-2259
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
aardappel
Product
Lobster
Classifications
CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record 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=2025.0
  2. Affected versionversion=2025.1
  3. Affected versionversion=2025.2
  4. Affected versionversion=2025.3
  5. Affected versionversion=2025.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

aardappel · Lobsterversion=2025.0; version=2025.1; version=2025.2; version=2025.3; version=2025.4

Published CVSS scores

1.7INCIBE-CERTAV:L/AC:L/Au:S/C:N/I:N/A:P
3.3INCIBE-CERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.8INCIBE-CERTCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

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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