Loading vulnerability…
CVE-2026-53586 is an origin-confusion flaw in libgit2's built-in HTTP transport. During an initial smart-HTTP request, libgit2 follows offsite redirects. If the redirected server responds with HTTP 401, the authentication handling path invokes the application's credential callback with the original remote URL rather than the redirected server URL. Credentials returned by a callback that authorizes the original trusted remote can then be retained and sent in an Authorization header to the redirected host. The issue affects versions prior to 1.8.6 and 1.9.5.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A credential-disclosure flaw in libgit2's built-in HTTP transport: credentials for the original remote can be sent in an Authorization header to an offsite redirected host after a 401 response.
A libgit2 vulnerability covered by Debian advisory DSA-6453 affecting Debian 13/libgit2 packages; the advisory states the issues could lead to arbitrary command execution on a remote SSH server, credential disclosure, denial of service, or directory creation outside a repository working tree.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.