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CERT Polska disclosed three vulnerabilities in GNU cpio affecting versions through 2.15, tracked as CVE-2026-66484, CVE-2026-66485, and CVE-2026-66486. The issues were reported by researchers from the AFINE Team and fixed in upstream commits. The most serious flaw allows path traversal during archive extraction, a weakness aligned with CWE-22, in which crafted file paths can escape the intended extraction directory and potentially overwrite or access files outside the restricted path.
The additional bugs include an uncontrolled memory allocation issue mapped to CWE-789 that can trigger a stack overflow and denial of service, and an improper output escaping flaw that can produce forged archive listings or inject terminal escape sequences. Together, the vulnerabilities expose users handling untrusted archives to file-system compromise, service disruption, and deceptive terminal output, underscoring the risk of insufficient pathname validation, unsafe memory handling, and unescaped archive metadata in command-line archive tools.
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On 2026-08-10, CERT Polska published CVE-2026-66484, CVE-2026-66485, and CVE-2026-66486 affecting GNU cpio through version 2.15. The disclosures covered a path traversal flaw, an uncontrolled memory allocation leading to stack overflow and denial of service, and an output escaping issue affecting archive listings.
GNU cpio fixed CVE-2026-66486, a CWE-116 issue in archive member listing where names were printed without quoting or escaping, enabling forged listings or terminal escape-sequence injection. The fix was made in upstream commit 2ff9600c9ef32e88759843cdbde74c8db5ae9b30.
GNU cpio fixed CVE-2026-66485, a CWE-789 issue in src/makepath.c where archive-controlled path lengths could drive unbounded alloca-based stack allocation and crash the process during extraction. The fix was made in upstream commit 3cd514031371d8aeeaf2048aa10103e02831aaa9.
GNU cpio fixed CVE-2026-66484, a CWE-22 path traversal issue in tar extraction copy-in mode where an unsanitized hard-link target could create a hard link to an external absolute path despite --no-absolute-filenames. The fix was made in upstream commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad.
CERT Polska received and coordinated disclosure for three GNU cpio vulnerabilities reported by Michał Majchrowicz and Marcin Wyczechowski from the AFINE Team. The source does not provide a specific date for when the report was submitted.
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CERT Polska disclosed three vulnerabilities in **GNU cpio** affecting versions through **2.15**, tracked as `CVE-2026-66484`, `CVE-2026-66485`, and `CVE-2026-66486`. The issues were reported by researchers from the **AFINE Team** and include a **path traversal** flaw during tar extraction, an **uncontrolled memory allocation** bug that can trigger **stack overflow** and **denial of service**, and an **improper output escaping** weakness. The output-handling flaw can allow **forged archive listings** or **terminal escape-sequence injection**, creating opportunities to mislead users or manipulate terminal output. CERT Polska said the vulnerabilities have been addressed in specific upstream commits, while a separate security notice amplified the disclosure and directed users to the CERT advisory for details on the affected GNU cpio software.
Aug 10, 2026
Multiple newly disclosed vulnerabilities exposed **arbitrary file write** paths through symlink handling and path validation failures in developer and server-side software. In **Crawl4AI** before `0.8.8`, `CVE-2026-56258` affects screenshot and PDF endpoints by combining weak `output_path` validation, symlink following, and a **TOCTOU** race, allowing unauthenticated remote attackers to write files outside the intended directory and potentially reach code execution. In **Cursor Desktop** before `3.0`, `CVE-2026-50549` lets a malicious agent escape the workspace sandbox by forcing path canonicalization to fail and then abusing an in-workspace symlink to write arbitrary files under the user’s privileges, including paths that could enable later unsandboxed execution. A related pattern also appeared in archive extraction and privileged upload handling. The **extract-zip** package is affected by `CVE-2026-56876`, which fails to validate symlink targets inside ZIP archives, enabling path traversal outside the extraction directory and possible arbitrary file read or write when processing untrusted archives. Separately, **pwnlift** disclosed `CVE-2026-56815` in a privileged upload handler that could be abused for arbitrary file write **as root** through direct symlink following and a TOCTOU race; an initial fix was bypassable before a follow-up patch was merged, while one downstream deployment mitigated exposure by removing the privileged `sudo` entry. Together, the disclosures highlight recurring risk from incomplete path canonicalization, unsafe symlink handling, and containment checks in file-write workflows.
Jul 2, 2026
A high-severity directory traversal flaw, **CVE-2026-17524**, has been disclosed in the `zip-lib` package before version `1.1.0`, allowing attackers to bypass extraction safeguards and write files outside the intended destination folder. The bug stems from cached path-validation results during archive extraction: `zip-lib` checks the `isOutsideTargetFolder` condition only when an initial directory symlink is created, enabling later archive entries to evade traversal protections. The issue is mapped to **CWE-22** and carries a **CVSS 3.1** score reflecting network-exploitable impact with high confidentiality risk. The vulnerability fits the long-running **Zip Slip** class of archive extraction bugs, in which crafted archive entries such as `../../` paths can overwrite arbitrary files and potentially lead to remote code execution across ZIP, TAR, JAR, CPIO, and other formats. Security research has shown this pattern affects thousands of projects across multiple ecosystems when extraction logic concatenates archive entry names without robust validation, and offensive testing tools such as **Archive Pwn** have made it easier to generate malicious archives using traversal paths, symlink abuse, Unicode tricks, and other bypass techniques. The `zip-lib` disclosure underscores that archive handling remains a persistent software supply chain and application security risk even years after the original Zip Slip wave of fixes.
Jul 29, 2026