Answer in brief
CVE-2026-93471 records a High severity (CVSS 8.7) vulnerability in Unbounded SAML message decompression in esaml allows memory exhaustion. The current sources do not mark it as known exploited. The current feed maps arekinath/arekinath/esaml (generic), dropbox/dropbox/esaml (generic), dropbox/esaml (generic), handnot2/handnot2/esaml (generic). 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 8.7. 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 arekinath/arekinath/esaml (generic), dropbox/dropbox/esaml (generic), dropbox/esaml (generic), handnot2/handnot2/esaml (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| arekinath/arekinath/esamlgeneric | >=deeb84378d5c82153b470e99d24f77c38afca14a <* | * |
| dropbox/dropbox/esamlgeneric | >=deeb84378d5c82153b470e99d24f77c38afca14a <* | * |
| dropbox/esamlgeneric | >=0.1.0 <* | * |
| handnot2/handnot2/esamlgeneric | >=deeb84378d5c82153b470e99d24f77c38afca14a <* | * |
Published upstream
Oct 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 22, 2026
Improper Handling of Highly Compressed Data (Data Amplification) in esaml_binding in dropbox esaml allows an unauthenticated attacker to exhaust server memory and crash the Erlang VM via a crafted compressed SAMLResponse. esaml_binding:decode_response/2 base64-decodes the attacker-supplied SAMLResponse, inflates it with zlib:unzip/1 with no bound on the output, then converts the result to a charlist with binary_to_list/1 before parsing. This runs on the SAML consume (ACS) and single-logout endpoints, which accept unauthenticated requests by design, and it runs before any signature check. A small deflate stream reaches a compression ratio near 1000 to 1, so a request body of tens of kilobytes inflates to hundreds of megabytes and then to several gigabytes of list heap, so a few requests exhaust memory and take the node down. This issue affects esaml: from 0.1.0 onward.
Quoted source text, attributed separately from HOL analysis.