{"id":"CVE-2026-0257","kind":"vulnerability","aliases":["CVE-2026-0257"],"related":[],"title":"paloaltonetworks pan-os: Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software…","description":"Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Palo Alto Networks PAN-OS, the firewall and VPN operating system, has an authentication bypass that lets an attacker establish an unauthorized VPN connection into the network. CISA lists it as actively exploited in the wild and tagged with ransomware use.","severity":"critical","cvss":9.1,"epss":null,"exploited":true,"exploited_at":"2026-05-29T00:00:00+00:00","products":[{"name":"Palo Alto Networks PAN-OS","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":["10.2.7"],"affected":"< 10.2.7","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.7","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.8","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.9","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.10","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.11","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.12","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.13","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.14","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.15","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.16","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.17","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.18","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.0","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.1","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.2","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.3","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.4","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.5","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.6","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.7","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.8","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.9","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.10","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.11","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.12","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.13","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.14","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.0","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.1","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.2","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.3","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.4","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.5","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.6","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.7","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.8","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.9","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.10","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.2.11","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","firewall","infrastructure","palo-alto","pan-os","ransomware","self-hosted","vpn"],"not_affected_if":["unknown"],"how_to_check":null,"fix":"Apply the vendor mitigations or patch per Palo Alto Networks advisory; discontinue use of the product if mitigations are unavailable (per CISA KEV guidance). Affected and fixed versions: unknown from the sources.","status":"open","published_at":"2026-05-13T19:17:01+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:34:00+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T20:34:00Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigations or patch per Palo Alto Networks advisory; discontinue use of the product if mitigations are unavailable (per CISA KEV guidance). Affected and fixed versions: unknown from the sources.","summary":"Palo Alto Networks PAN-OS, the firewall and VPN operating system, has an authentication bypass that lets an attacker establish an unauthorized VPN connection into the network. CISA lists it as actively exploited in the wild and tagged with ransomware use.","category":"infrastructure","who_cares":["palo-alto","pan-os","firewall","vpn","self-hosted"],"confidence":0.7,"analyst_note":"Find affected and fixed PAN-OS versions and the vendor advisory for CVE-2026-0257 (search the Palo Alto Networks security advisories page) and add concrete how_to_check steps.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"severity_if_unknown":"high"},"cost_usd":0.000384,"input_tokens":2094,"output_tokens":349,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':286C '-0257':24A,27A '-2026':23A,26A '22':285C 'action':276C 'activ':240B 'allow':262C 'alto':16A,29A,199B,209B,251C 'appli':277C 'applic':283C 'attack':227B,263C 'authent':5A,222B,258C 'bod':284C 'bypass':6A,223B,259C,265C 'cisa':236B,274C 'cloud':289C 'connect':232B,273C 'contain':256C 'cve':22A,25A 'discontinu':292C 'establish':228B,269C 'exploit':194B,241B 'firewal':195B,215B 'follow':282C 'gateway':13A 'globalprotect':10A 'guidanc':287C 'host':206B 'infrastructur':196B 'instruct':281C 'let':225B 'list':237B 'mitig':278C,298C 'network':17A,210B,235B,252C 'networks':30A 'oper':218B 'os':4A,20A,33A,37A,41A,45A,49A,53A,57A,61A,65A,69A,73A,77A,81A,85A,89A,93A,97A,101A,105A,109A,113A,117A,121A,125A,129A,133A,137A,141A,145A,149A,153A,157A,161A,165A,169A,173A,177A,181A,185A,189A,193A,202B,213B,255C 'palo':15A,28A,198B,208B,250C 'palo-alto':197B 'paloaltonetwork':1A 'paloaltonetworks':34A,38A,42A,46A,50A,54A,58A,62A,66A,70A,74A,78A,82A,86A,90A,94A,98A,102A,106A,110A,114A,118A,122A,126A,130A,134A,138A,142A,146A,150A,154A,158A,162A,166A,170A,174A,178A,182A,186A,190A 'pan':3A,19A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A,84A,88A,92A,96A,100A,104A,108A,112A,116A,120A,124A,128A,132A,136A,140A,144A,148A,152A,156A,160A,164A,168A,172A,176A,180A,184A,188A,192A,201B,212B,254C 'pan-o':2A,18A,200B,211B,253C 'pan-os':31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,79A,83A,87A,91A,95A,99A,103A,107A,111A,115A,119A,123A,127A,131A,135A,139A,143A,147A,151A,155A,159A,163A,167A,171A,175A,179A,183A,187A,191A 'per':279C 'portal':11A 'product':296C 'ransomwar':203B,248B 'requir':275C 'restrict':267C 'secur':266C 'self':205B 'self-host':204B 'servic':290C 'softwar':21A 'system':219B 'tag':246B 'unauthor':230B,271C 'unavail':300C 'use':249B,293C 'vendor':280C 'vpn':207B,217B,231B,272C 'vulner':7A,260C 'wild':244B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-05-13T19:17:01+00:00","kev":{"dateAdded":"2026-05-29","dueDate":"2026-06-01","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:D/RE:M/U:Red","cvss_by":"psirt@paloaltonetworks.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-0257","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-0257","severity":null,"published_at":"2026-05-29T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T10:39:04+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-0257","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0257","severity":null,"published_at":"2026-05-13T19:17:01+00:00","modified_at":"2026-06-17T10:10:37+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}