EUVD-2026-42295Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Network vector because attacker serves the archive remotely; AC:H due to hard legacy-p7zip prerequisite; UI:R for required user-initiated scan; I:L only as symlink is planted but not resolved.
Primary rating from Vendor (BLSOPS).
CVSS VectorVendor: BLSOPS
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Lifecycle Timeline
1DescriptionCVE.org
BBOT's unarchive module rejects archives containing symlink entries before extraction, but for zip and 7z archives it failed to detect symlinks whose listing carries a DOS-attribute prefix before the unix mode, as produced by legacy versions of p7zip. Such an archive, downloaded and extracted during a scan (for example via filedownload), bypassed the guard and caused an attacker-controlled symlink to be written into the extraction directory. The effect is limited to planting the symlink (its target is not written through), and only hosts using such a legacy p7zip build are affected; current mainline 7-Zip is not.
AnalysisAI
Symlink extraction bypass in BBOT's unarchive module allows an attacker to plant an attacker-controlled symlink into the extraction directory when BBOT scans and fetches a crafted zip or 7z archive. The bypass exploits BBOT's failure to detect symlink entries carrying a DOS-attribute prefix before the unix mode field, a format produced by legacy p7zip builds - a variant the pre-extraction guard did not account for. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following to be true simultaneously: (1) the BBOT scan must be configured to use the filedownload (or equivalent) module so that it fetches and extracts remote archives, (2) the scanning host must have a legacy p7zip build installed - current mainline 7-Zip does not produce the triggering DOS-attribute-prefixed symlink format and is not affected, (3) the attacker must be able to serve a crafted zip or 7z archive to the scanner (e.g., by hosting it on a web server that falls within the scan's target scope), and (4) a user must actively initiate the BBOT scan (UI:R per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 base score of 3.1 (Low) is consistent with the narrow real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker places a specially crafted zip or 7z archive on a server within a BBOT scan's target scope, where the archive contains a symlink entry formatted with a DOS-attribute prefix as produced by legacy p7zip. When a security operator runs a BBOT scan that includes the filedownload module and the scanner fetches and extracts the archive, BBOT's symlink guard fails to detect the entry, writing an attacker-controlled symlink into the local extraction directory. … |
| Remediation | Apply the upstream fix by updating BBOT to a version incorporating commit a3f1a2292e2b0a553827c6175b761abe28807735 (https://github.com/blacklanternsecurity/bbot/commit/a3f1a2292e2b0a553827c6175b761abe28807735). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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