Answer in brief
CVE-2026-71326 records a Low severity (CVSS 2.1) vulnerability in Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing. The current sources do not mark it as known exploited. The current feed maps traefik/traefik (generic), github.com/traefik/traefik/v3 (go), github.com/traefik/traefik/v3 (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-71326 records a Low severity (CVSS 2.1) vulnerability in Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing. The current sources do not mark it as known exploited. The current feed maps traefik/traefik (generic), github.com/traefik/traefik/v3 (go), github.com/traefik/traefik/v3 (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps traefik/traefik (generic), github.com/traefik/traefik/v3 (go), github.com/traefik/traefik/v3 (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| traefik/traefikgeneric | >= 3.6.11, < 3.6.25 || >= 3.7.0, < 3.7.10 | Not reported |
| github.com/traefik/traefik/v3go | >=3.6.11,<=3.6.24 | 3.6.25 |
| github.com/traefik/traefik/v3go | >=3.7.0,<=3.7.9 | 3.7.10 |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.
Quoted source text, attributed separately from HOL analysis.
CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps traefik/traefik (generic), github.com/traefik/traefik/v3 (go), github.com/traefik/traefik/v3 (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| traefik/traefikgeneric | >= 3.6.11, < 3.6.25 || >= 3.7.0, < 3.7.10 | Not reported |
| github.com/traefik/traefik/v3go | >=3.6.11,<=3.6.24 | 3.6.25 |
| github.com/traefik/traefik/v3go | >=3.7.0,<=3.7.9 | 3.7.10 |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.
Quoted source text, attributed separately from HOL analysis.