Re: HSTS cache cap allows eviction of security entries

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Message-ID: <[email protected]>
Date: Thu, 2 Apr 2026 10:42:23 -0400
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User-Agent: Mozilla Thunderbird
Subject: Re: HSTS cache cap allows eviction of security entries
To: [email protected], libcurl development <[email protected]>
References: <[email protected]>
 <CAH8yC8=7CZHo9X0_QktfgSJy2ZuncpN5bQ_jd8onmpQGAPdNiw@mail.gmail.com>
Content-Language: en-US
From: Demi Marie Obenour <[email protected]>
Autocrypt: [email protected]; keydata=
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In-Reply-To: <CAH8yC8=7CZHo9X0_QktfgSJy2ZuncpN5bQ_jd8onmpQGAPdNiw@mail.gmail.com>

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On 4/1/26 17:02, Jeffrey Walton via curl-library wrote:
> On Wed, Apr 1, 2026 at 4:55=E2=80=AFPM Daniel Stenberg via curl-library=

> <[email protected]> wrote:
>>
>> Hey,
>>
>> Today I implemented a cap in how many HSTS entries libcurl keeps in me=
mory, to
>> prevent it from being a never-ending growth that could eventually caus=
e
>> problems. I set the limit to 1000 entries, quite arbitrarily.
>>
>> The oldest entry gets evicted when more are added.
>>
>> This can however, perhaps, have an effect on security if someone happe=
ns to
>> load countless pages with HSTS and the list adds up. Or as one of our =
AI code
>> analyzers expressed it:
>>
>>   The new hsts_append() drops the oldest HSTS entry once the list reac=
hes
>>   MAX_HSTS_ENTRIES. Because curl only upgrades HTTP to HTTPS when an H=
STS entry
>>   is present, an attacker who can coerce a client into visiting many u=
nique
>>   HTTPS hosts with HSTS headers (for example via redirect chains under=
 their
>>   control) can evict previously stored HSTS policies. Once the target =
entry is
>>   evicted, subsequent HTTP URLs to that host will no longer be upgrade=
d,
>>   opening a downgrade window for MITM. This is a security regression c=
ompared
>>   to the previous unlimited retention.
>>
>> It seems correct, but is this anything we can actually protect against=
? Having
>> an unlimited cache in memory seems like a bad idea as well...
>=20
> Instead of a machine wide implementation, perhaps the HSTS cache can
> be per-app.  Then the app can select a policy:
>=20
> 1. Unlimited HSTS records, and risk getting OOM killed
> 2. FIFO queue with a soft limit, like proposed above
>=20
> Choice (2) leads to policy choices:
>=20
> (a) silently evict
> (b) return error, and don't fetch
> (c) die with an error
>=20
> Jeff

I wonder if it would make sense to have a system-wide daemon in charge of=
 transfers.
That daemon could maintain the cache on disk.

Obviously way out of scope for curl, though!
--=20
Sincerely,
Demi Marie Obenour (she/her/hers)
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