CVE-2026-34978 | OpenPrinting CUPS up to 2.4.16 on Linux rename path traversal

VDB-355210 · CVE-2026-34978 · GCVE-0-2026-34978 OPENPRINTING CUPS UP TO 2.4.16 ON LINUX RENAME PATH TRAVERSAL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.4 $0-$5k 0.79 Summaryinfo A vulnerability, which was classified as critical, was found in OpenPrinting CUPS up to 2.4.16 on Linux. This impacts the function rename. Executing a manipulation can lead to path traversal. This vulnerability is registered as CVE-2026-34978. It is possible to launch the attack remotely. No exploit is available. Detailsinfo A vulnerability was found in OpenPrinting CUPS up to 2.4.16 on Linux. It has been declared as critical. This vulnerability affects the function rename. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect integrity, and availability. CVE summarizes: OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, the RSS notifier allows .. path traversal in notify-recipient-uri (e.g., rss:///../job.cache), letting a remote IPP client write RSS XML bytes outside CacheDir/rss (anywhere that is lp-writable). In particular, because CacheDir is group-writable by default (typically root:lp and mode 0770), the notifier (running as lp) can replace root-managed state files via temp-file + rename(). This PoC clobbers CacheDir/job.cache with RSS XML, and after restarting cupsd the scheduler fails to parse the job cache and previously queued jobs disappear. At time of publication, there are no publicly available patches. The advisory is available at github.com. This vulnerability was named CVE-2026-34978 since 03/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/03/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Printing Software Vendor OpenPrinting Name CUPS Version 2.4.0 2.4.1 2.4.2 2.4.3 2.4.4 2.4.5 2.4.6 2.4.7 2.4.8 2.4.9 2.4.10 2.4.11 2.4.12 2.4.13 2.4.14 2.4.15 2.4.16 Website Product: https://github.com/OpenPrinting/cups/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.5 VulDB Meta Temp Score: 6.4 VulDB Base Score: 6.5 VulDB Temp Score: 6.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.5 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Path traversal CWE: CWE-22 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/31/2026 CVE reserved 04/03/2026 +3 days Advisory disclosed 04/03/2026 +0 days VulDB entry created 04/03/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Not defined CVE: CVE-2026-34978 (🔒) GCVE (CVE): GCVE-0-2026-34978 GCVE (VulDB): GCVE-100-355210 Entryinfo Created: 04/03/2026 23:32 Changes: 04/03/2026 23:32 (64) Complete: 🔍 Cache ID: 99:EE3:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸