CVE-2026-40194Disclosure(phpseclib / phpseclib)

LOWCVSS 3.7 · LOW

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch phpseclib phpseclib systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.

phpseclib CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Patch / fix

https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac

Vendor / third-party advisories

Other references

Weakness type (CWE)

CWE-208

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

phpseclib

Threat summary

Patch or workaround signal is available
2 mentions across 2 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
Disclosure: 2 classified signals
Peaked 1d ago at 1 mentions (2026-04-10); latest day: 1
2 total mentions across 2 days

Affected systems

Vendors

phpseclib

Products

phpseclib

Deep dive

Activity timeline2 mentions / 2d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

cvereports@_cvereports163d
Disclosure
CVE-2026-40194: CVE-2026-40194: Observable Timing Discrepancy in phpseclib SSH2 HMAC Verification CVE-2026-40194 identifies a timing side-channel vulnerability in the phpseclib library's SSH2 implementation. The vulnerability arises from the use of a ... https://cvereports.com/reports/CVE-2026-40194
Post summary
CVE‑2026‑40194 is a newly disclosed timing side‑channel vulnerability in the phpseclib SSH2 HMAC verification process, with no PoC, exploit code, patch, or active exploitation reported at this time.
0000024
36 followersView on X
CVE@CVEnew181d
Disclosure
CVE-2026-40194 phpseclib is a PHP secure communications library. Prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a rec… https://www.cve.org/CVERecord?id=CVE-2026-40194
Post summary
The text discloses technical details of CVE-2026-40194, a flaw in phpseclib’s SSH2 packet handling, and notes that versions 3.0.51, 2.0.53, and 1.0.28 address the issue.
0000059
57.0K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	phpseclib	phpseclib	-	-	-

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