CVE-2026-55599
Description
phpseclib is a PHP secure communications library. From 0.1.1 until 1.0.30, 2.0.55, and 3.0.54, when an application validates an untrusted X.509 certificate with phpseclib, X509::validateSignature() reads a URL out of that certificate's Authority Information Access (AIA) extension and connects to it. Attacker who supplies certificate fully controls host, port, and path of that connection. URL fetching is enabled by default, and no destination is blocked. An unauthenticated attacker can therefore make a validating server open connections to internal hosts and ports it should never reach, for example loopback 127.0.0.1, cloud metadata address 169.254.169.254, and internal-only services. This is a server-side request forgery (SSRF) caused by an insecure default. This vulnerability is fixed in 1.0.30, 2.0.55, and 3.0.54.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
phpseclib/phpseclibPackagist | >= 0.1.1, < 1.0.30 | 1.0.30 |
phpseclib/phpseclibPackagist | >= 2.0.0, < 2.0.55 | 2.0.55 |
phpseclib/phpseclibPackagist | >= 3.0.0, < 3.0.54 | 3.0.54 |
Affected products
6- osv-coords4 versionspkg:apk/chainguard/nextcloud-server-32pkg:apk/chainguard/nextcloud-server-33pkg:apk/wolfi/nextcloud-server-32pkg:apk/wolfi/nextcloud-server-33
< 32.0.11-r2+ 3 more
- (no CPE)range: < 32.0.11-r2
- (no CPE)range: < 33.0.5-r3
- (no CPE)range: < 32.0.11-r2
- (no CPE)range: < 33.0.5-r3
Patches
Vulnerability mechanics
References
3- github.com/phpseclib/phpseclib/security/advisories/GHSA-m557-wrgg-6rp4nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-m557-wrgg-6rp4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-55599ghsaADVISORY
News mentions
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